Remove "unnecessary" imports. (#78663)

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

@@ -6,7 +6,6 @@ import 'dart:math' as math;
 
 import 'package:flutter/widgets.dart';
 import 'package:flutter/rendering.dart';
-import 'package:flutter/services.dart';
 
 import 'localizations.dart';
 import 'text_selection_toolbar.dart';

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

@@ -6,7 +6,6 @@ import 'dart:collection' show Queue;
 import 'dart:math' as math;
 
 import 'package:flutter/widgets.dart';
-import 'package:flutter/rendering.dart';
 import 'package:vector_math/vector_math_64.dart' show Vector3;
 
 import 'bottom_navigation_bar_theme.dart';

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

@@ -2,10 +2,6 @@
 // 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/gestures.dart';
-
-import 'package:flutter/rendering.dart';
 import 'package:flutter/widgets.dart';
 
 import 'constants.dart';

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

@@ -6,7 +6,6 @@ import 'dart:math' as math;
 import 'dart:ui' show lerpDouble;
 
 import 'package:flutter/foundation.dart';
-import 'package:flutter/rendering.dart';
 import 'package:flutter/widgets.dart';
 
 import 'button_style.dart';

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

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'package:flutter/rendering.dart';
 import 'package:flutter/widgets.dart';
 
 import 'button.dart';

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

@@ -6,7 +6,6 @@ import 'dart:math' as math;
 import 'dart:ui' show lerpDouble;
 
 import 'package:flutter/foundation.dart';
-import 'package:flutter/rendering.dart';
 import 'package:flutter/widgets.dart';
 
 import 'button_style.dart';

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

@@ -5,7 +5,6 @@
 import 'dart:math' as math;
 
 import 'package:flutter/gestures.dart' show DragStartBehavior;
-import 'package:flutter/rendering.dart';
 import 'package:flutter/widgets.dart';
 
 import 'button_bar.dart';

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

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'package:flutter/rendering.dart';
 import 'package:flutter/widgets.dart';
 
 import 'constants.dart';

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

@@ -6,7 +6,6 @@ import 'dart:math' as math;
 import 'dart:ui' show lerpDouble;
 
 import 'package:flutter/foundation.dart';
-import 'package:flutter/rendering.dart';
 import 'package:flutter/widgets.dart';
 
 import 'button_style.dart';

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

@@ -2,9 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'package:flutter/animation.dart';
-import 'package:flutter/foundation.dart';
-import 'package:flutter/gestures.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter/widgets.dart';
 

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

@@ -11,7 +11,6 @@ import 'package:flutter/services.dart';
 
 import 'box.dart';
 import 'layer.dart';
-import 'mouse_tracker.dart';
 import 'object.dart';
 
 

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

@@ -15,7 +15,6 @@ import 'package:vector_math/vector_math_64.dart';
 import 'box.dart';
 import 'layer.dart';
 import 'layout_helper.dart';
-import 'mouse_tracker.dart';
 import 'object.dart';
 
 export 'package:flutter/gestures.dart' show

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

@@ -2,8 +2,6 @@
 // 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 'actions.dart';
 import 'editable_text.dart';
 import 'framework.dart';