[mus]Add FrameGenerator::SetHighContrastMode(bool)

services/ui/ws/platform_display_default.h

Index: services/ui/ws/platform_display_default.h
diff --git a/services/ui/ws/platform_display_default.h b/services/ui/ws/platform_display_default.h
index 399594c03f9db6f83a73254dde4854c76a6cbd0c..25f4755df4bd21c1378871c80114aaa1bffdc22d 100644
--- a/services/ui/ws/platform_display_default.h
+++ b/services/ui/ws/platform_display_default.h
@@ -10,7 +10,6 @@
 #include "base/macros.h"
 #include "services/ui/display/viewport_metrics.h"
 #include "services/ui/ws/frame_generator.h"
-#include "services/ui/ws/frame_generator_delegate.h"
 #include "services/ui/ws/platform_display.h"
 #include "services/ui/ws/platform_display_delegate.h"
 #include "services/ui/ws/server_window.h"
@@ -27,8 +26,7 @@ namespace ws {
 // PlatformDisplay implementation that connects to a PlatformWindow and
 // FrameGenerator for Chrome OS.
 class PlatformDisplayDefault : public PlatformDisplay,
-                               public ui::PlatformWindowDelegate,
-                               public FrameGeneratorDelegate {
+                               public ui::PlatformWindowDelegate {
  public:
   PlatformDisplayDefault(ServerWindow* root_window,
                          const display::ViewportMetrics& metrics);
@@ -68,9 +66,6 @@ class PlatformDisplayDefault : public PlatformDisplay,
   void OnAcceleratedWidgetDestroyed() override;
   void OnActivationChanged(bool active) override;
 
-  // FrameGeneratorDelegate:
-  bool IsInHighContrastMode() override;
-
   ServerWindow* root_window_;
 
 #if !defined(OS_ANDROID)