Remove remaining uses of hashValues in the framework

See dart-lang/sdk#25217

Author: jason-simmons

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

@@ -2148,8 +2148,8 @@ class ThemeData with Diagnosticable {
       // GENERAL CONFIGURATION
       applyElevationOverlayColor,
       cupertinoOverrideTheme,
-      hashList(extensions.keys),
-      hashList(extensions.values),
+      ...extensions.keys,
+      ...extensions.values,
       inputDecorationTheme,
       materialTapTargetSize,
       pageTransitionsTheme,

packages/flutter/lib/src/painting/basic_types.dart

@@ -43,8 +43,8 @@ export 'dart:ui' show
   VertexMode,
   // TODO(werainkhatri): remove these after their deprecation period in engine
   // https://github.com/flutter/flutter/pull/99505
-  hashValues,
-  hashList;
+  hashValues, // ignore: deprecated_member_use
+  hashList; // ignore: deprecated_member_use
 
 export 'package:flutter/foundation.dart' show VoidCallback;
 

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

@@ -523,7 +523,7 @@ class SelectionGeometry {
 
   @override
   int get hashCode {
-    return hashValues(
+    return Object.hash(
       startSelectionPoint,
       endSelectionPoint,
       status,
@@ -574,7 +574,7 @@ class SelectionPoint {
 
   @override
   int get hashCode {
-    return hashValues(
+    return Object.hash(
       localPosition,
       lineHeight,
       handleType,