Remove "unnecessary" imports. (#26580)

lib/web_ui/lib/src/engine/canvaskit/embedded_views.dart

@@ -7,16 +7,6 @@ import 'dart:html' as html;
 import 'package:ui/src/engine.dart';
 import 'package:ui/ui.dart' as ui;
 
-import '../html/path_to_svg_clip.dart';
-import '../util.dart';
-import '../vector_math.dart';
-import 'canvas.dart';
-import 'initialization.dart';
-import 'path.dart';
-import 'picture_recorder.dart';
-import 'surface.dart';
-import 'surface_factory.dart';
-
 /// This composites HTML views into the [ui.Scene].
 class HtmlViewEmbedder {
   /// The [HtmlViewEmbedder] singleton.

lib/web_ui/lib/src/engine/canvaskit/surface_factory.dart

@@ -5,9 +5,6 @@
 import 'package:meta/meta.dart';
 import 'package:ui/src/engine.dart';
 
-import 'embedded_views.dart';
-import 'surface.dart';
-
 /// Caches surfaces used to overlay platform views.
 class SurfaceFactory {
   /// The cache singleton.

lib/web_ui/test/canvaskit/common.dart

@@ -5,7 +5,6 @@
 import 'package:test/test.dart';
 
 import 'package:ui/src/engine.dart';
-import 'package:ui/src/engine/canvaskit/surface_factory.dart';
 import 'package:ui/ui.dart' as ui;
 
 /// Whether the current browser is Safari on iOS.

lib/web_ui/test/engine/surface/path/path_iterator_test.dart

@@ -5,7 +5,6 @@
 import 'dart:typed_data';
 
 import 'package:ui/src/engine.dart';
-import 'package:ui/src/engine/html/path/path_utils.dart';
 import 'package:test/bootstrap/browser.dart';
 import 'package:test/test.dart';
 

lib/web_ui/test/engine/surface/path/path_winding_test.dart

@@ -8,7 +8,6 @@ import 'package:test/bootstrap/browser.dart';
 import 'package:test/test.dart';
 import 'package:ui/ui.dart' hide window;
 import 'package:ui/src/engine.dart';
-import 'package:ui/src/engine/html/path/path_utils.dart';
 
 void main() {
   internalBootstrapBrowserTest(() => testMain);

lib/web_ui/test/path_test.dart

@@ -10,8 +10,6 @@ import 'package:test/bootstrap/browser.dart';
 import 'package:test/test.dart';
 import 'package:ui/ui.dart' hide window;
 import 'package:ui/src/engine.dart';
-import 'package:ui/src/engine/html/path/path_ref.dart';
-import 'package:ui/src/engine/html/path/path_utils.dart';
 
 import 'matchers.dart';