Remove ScheduleAnimation proxy methods, call HostWindow directly

third_party/WebKit/Source/core/frame/VisualViewport.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 657 matching lines @@
                                    GraphicsLayerPaintingPhase,
                                    const IntRect&) const {}
 
 LocalFrame* VisualViewport::MainFrame() const {
   return GetPage().MainFrame() && GetPage().MainFrame()->IsLocalFrame()
              ? GetPage().DeprecatedLocalMainFrame()
              : 0;
 }
 
 bool VisualViewport::ScheduleAnimation() {
-  return MainFrame()->ScheduleAnimation(GetHostWindow());
+  if (HostWindow* window = GetHostWindow()) {
+    window->ScheduleAnimation(MainFrame());
+    return true;
+  }
+  return false;
 }
 
 void VisualViewport::ClampToBoundaries() {
   SetLocation(FloatPoint(offset_));
 }
 
 FloatRect VisualViewport::ViewportToRootFrame(
     const FloatRect& rect_in_viewport) const {
   FloatRect rect_in_root_frame = rect_in_viewport;
   rect_in_root_frame.Scale(1 / Scale());
@@ skipping 159 matching lines @@
   } else if (graphics_layer == root_transform_layer_.get()) {
     name = "Root Transform Layer";
   } else {
     ASSERT_NOT_REACHED();
   }
 
   return name;
 }
 
 }  // namespace blink