Remove unused field initializing formal parameters. (#30822)

Author: scheglov

lib/web_ui/lib/src/engine/html/path/path_metrics.dart

@@ -44,16 +44,13 @@ class SurfacePathMetrics extends IterableBase<ui.PathMetric>
 
 /// Maintains a single instance of computed segments for set of PathMetric
 /// objects exposed through iterator.
-///
-/// [resScale] controls the precision of measure when values > 1.
 class _SurfacePathMeasure {
-  _SurfacePathMeasure(this._path, this.forceClosed, {this.resScale = 1.0})
+  _SurfacePathMeasure(this._path, this.forceClosed)
       :
         // nextContour will increment this to the zero based index.
         _currentContourIndex = -1,
         _pathIterator = PathIterator(_path, forceClosed);
 
-  final double resScale;
   final PathRef _path;
   PathIterator _pathIterator;
   final List<_PathContourMeasure> _contours = <_PathContourMeasure>[];

lib/web_ui/lib/src/ui/window.dart

@@ -252,11 +252,11 @@ class IsolateNameServer {
 SingletonFlutterWindow get window => engine.window;
 
 class FrameData {
-  const FrameData._({this.frameNumber = -1});
+  const FrameData._();
 
-  const FrameData.webOnly() : frameNumber = -1;
+  const FrameData.webOnly();
 
-  final int frameNumber;
+  int get frameNumber => -1;
 }
 
 class GestureSettings {