Remove imports of meta (#9081)

packages/flutter/lib/src/cupertino/dialog.dart

@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import 'package:flutter/foundation.dart';
 import 'package:flutter/widgets.dart';
-import 'package:meta/meta.dart';
 
 // TODO(abarth): These constants probably belong somewhere more general.
 

packages/flutter/lib/src/cupertino/switch.dart

@@ -5,10 +5,10 @@
 import 'dart:math' as math;
 import 'dart:ui' show lerpDouble;
 
+import 'package:flutter/foundation.dart';
 import 'package:flutter/gestures.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter/widgets.dart';
-import 'package:meta/meta.dart';
 
 import 'thumb_painter.dart';
 

packages/flutter/lib/src/foundation/binding.dart

@@ -7,7 +7,7 @@ import 'dart:convert' show JSON;
 import 'dart:developer' as developer;
 import 'dart:io' show exit;
 
-import 'package:meta/meta.dart';
+import 'package:flutter/foundation.dart';
 
 import 'assertions.dart';
 import 'basic_types.dart';

packages/flutter/lib/src/foundation/change_notifier.dart

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'package:meta/meta.dart';
+import 'package:flutter/foundation.dart';
 
 import 'assertions.dart';
 import 'basic_types.dart';

packages/flutter/lib/src/material/dialog.dart

@@ -4,8 +4,8 @@
 
 import 'dart:async';
 
+import 'package:flutter/foundation.dart';
 import 'package:flutter/widgets.dart';
-import 'package:meta/meta.dart';
 
 import 'button.dart';
 import 'button_bar.dart';

packages/flutter/lib/src/material/grid_tile.dart

@@ -4,7 +4,6 @@
 
 import 'package:flutter/foundation.dart';
 import 'package:flutter/widgets.dart';
-import 'package:meta/meta.dart';
 
 /// A tile in a material design grid list.
 ///

packages/flutter/lib/src/material/ink_well.dart

@@ -4,10 +4,10 @@
 
 import 'dart:collection';
 
+import 'package:flutter/foundation.dart';
 import 'package:flutter/gestures.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter/widgets.dart';
-import 'package:meta/meta.dart';
 
 import 'debug.dart';
 import 'ink_highlight.dart';

packages/flutter/lib/src/material/list_tile.dart

@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import 'package:flutter/foundation.dart';
 import 'package:flutter/widgets.dart';
-import 'package:meta/meta.dart';
 
 import 'colors.dart';
 import 'constants.dart';

packages/flutter/lib/src/material/page.dart

@@ -4,7 +4,6 @@
 
 import 'package:flutter/foundation.dart';
 import 'package:flutter/widgets.dart';
-import 'package:meta/meta.dart';
 
 import 'material.dart';
 import 'theme.dart';

packages/flutter/lib/src/rendering/editable.dart

@@ -5,9 +5,9 @@
 import 'dart:math' as math;
 import 'dart:ui' as ui show TextBox;
 
+import 'package:flutter/foundation.dart';
 import 'package:flutter/gestures.dart';
 import 'package:flutter/services.dart';
-import 'package:meta/meta.dart';
 
 import 'box.dart';
 import 'object.dart';

packages/flutter/lib/src/rendering/sliver.dart

@@ -6,7 +6,6 @@ import 'dart:math' as math;
 
 import 'package:flutter/foundation.dart';
 import 'package:flutter/gestures.dart';
-import 'package:meta/meta.dart';
 import 'package:vector_math/vector_math_64.dart';
 
 import 'binding.dart';

packages/flutter/lib/src/rendering/sliver_fixed_extent_list.dart

@@ -4,7 +4,7 @@
 
 import 'dart:math' as math;
 
-import 'package:meta/meta.dart';
+import 'package:flutter/foundation.dart';
 
 import 'box.dart';
 import 'sliver.dart';

packages/flutter/lib/src/rendering/sliver_grid.dart

@@ -4,7 +4,7 @@
 
 import 'dart:math' as math;
 
-import 'package:meta/meta.dart';
+import 'package:flutter/foundation.dart';
 
 import 'box.dart';
 import 'object.dart';

packages/flutter/lib/src/rendering/sliver_list.dart

@@ -3,7 +3,6 @@
 // found in the LICENSE file.
 
 import 'package:flutter/foundation.dart';
-import 'package:meta/meta.dart';
 
 import 'box.dart';
 import 'sliver.dart';

packages/flutter/lib/src/rendering/sliver_multi_box_adaptor.dart

@@ -4,7 +4,6 @@
 
 import 'package:flutter/foundation.dart';
 import 'package:flutter/gestures.dart';
-import 'package:meta/meta.dart';
 import 'package:vector_math/vector_math_64.dart';
 
 import 'binding.dart';

packages/flutter/lib/src/rendering/sliver_padding.dart

@@ -6,7 +6,6 @@ import 'dart:math' as math;
 
 import 'package:flutter/foundation.dart';
 import 'package:flutter/gestures.dart';
-import 'package:meta/meta.dart';
 import 'package:vector_math/vector_math_64.dart';
 
 import 'binding.dart';

packages/flutter/lib/src/rendering/sliver_persistent_header.dart

@@ -6,7 +6,6 @@ import 'dart:math' as math;
 
 import 'package:flutter/foundation.dart';
 import 'package:flutter/gestures.dart';
-import 'package:meta/meta.dart';
 import 'package:vector_math/vector_math_64.dart';
 
 import 'binding.dart';

packages/flutter/lib/src/rendering/viewport.dart

@@ -6,7 +6,6 @@ import 'dart:math' as math;
 
 import 'package:flutter/foundation.dart';
 import 'package:flutter/gestures.dart';
-import 'package:meta/meta.dart';
 import 'package:vector_math/vector_math_64.dart';
 
 import 'binding.dart';

packages/flutter/lib/src/rendering/viewport_offset.dart

@@ -3,7 +3,6 @@
 // found in the LICENSE file.
 
 import 'package:flutter/foundation.dart';
-import 'package:meta/meta.dart';
 
 /// The direction of a scroll, relative to the positive scroll offset axis given
 /// by an [AxisDirection] and a [GrowthDirection].

packages/flutter/lib/src/services/message_codec.dart

@@ -5,7 +5,7 @@
 import 'dart:typed_data';
 import 'dart:ui' show hashValues;
 
-import 'package:meta/meta.dart';
+import 'package:flutter/foundation.dart';
 
 /// A message encoding/decoding mechanism.
 ///

packages/flutter/lib/src/services/message_codecs.dart

@@ -5,8 +5,7 @@
 import 'dart:convert';
 import 'dart:typed_data';
 
-import 'package:flutter/foundation.dart' show ReadBuffer, WriteBuffer;
-import 'package:meta/meta.dart';
+import 'package:flutter/foundation.dart' show ReadBuffer, WriteBuffer, required;
 
 import 'message_codec.dart';
 

packages/flutter/lib/src/services/text_editing.dart

@@ -4,7 +4,7 @@
 
 import 'dart:ui' show hashValues, TextAffinity, TextPosition;
 
-import 'package:meta/meta.dart';
+import 'package:flutter/foundation.dart';
 
 export 'dart:ui' show TextAffinity, TextPosition;
 

packages/flutter/lib/src/widgets/page_view.dart

@@ -8,7 +8,6 @@ import 'dart:math' as math;
 import 'package:flutter/foundation.dart';
 import 'package:flutter/physics.dart';
 import 'package:flutter/rendering.dart';
-import 'package:meta/meta.dart';
 
 import 'basic.dart';
 import 'framework.dart';

packages/flutter/lib/src/widgets/scroll_controller.dart

@@ -6,7 +6,6 @@ import 'dart:async';
 
 import 'package:flutter/animation.dart';
 import 'package:flutter/foundation.dart';
-import 'package:meta/meta.dart';
 
 import 'scroll_position.dart';
 

packages/flutter/lib/src/widgets/scroll_view.dart

@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import 'package:flutter/foundation.dart';
 import 'package:flutter/rendering.dart';
-import 'package:meta/meta.dart';
 
 import 'basic.dart';
 import 'framework.dart';