Remove "unnecessary" imports from flutter/src/gestures (#73389)

packages/flutter/lib/src/gestures/force_press.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 'dart:ui' show Offset;
-
 import 'package:flutter/foundation.dart';
 
 import 'arena.dart';

packages/flutter/lib/src/gestures/multidrag.dart

@@ -4,7 +4,6 @@
 
 
 import 'dart:async';
-import 'dart:ui' show Offset;
 
 import 'package:flutter/foundation.dart';
 

packages/flutter/lib/src/gestures/multitap.dart

@@ -3,7 +3,6 @@
 // found in the LICENSE file.
 
 import 'dart:async';
-import 'dart:ui' show Offset;
 import 'package:vector_math/vector_math_64.dart';
 
 import 'arena.dart';

packages/flutter/lib/src/gestures/recognizer.dart

@@ -5,7 +5,6 @@
 
 import 'dart:async';
 import 'dart:collection';
-import 'dart:ui' show Offset;
 
 import 'package:vector_math/vector_math_64.dart';
 import 'package:flutter/foundation.dart';

packages/flutter/lib/src/gestures/velocity_tracker.dart

@@ -3,8 +3,6 @@
 // found in the LICENSE file.
 
 
-import 'dart:ui' show Offset;
-
 import 'package:flutter/foundation.dart';
 
 import 'events.dart';