Part 1 to rename platform/Widget to platform/FrameViewBase.

third_party/WebKit/Source/platform/exported/WebScrollbarThemeClientImpl.h

 /*
  * Copyright (C) 2012 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 35 matching lines @@
   WebScrollbarThemeClientImpl(WebScrollbar&);
   ~WebScrollbarThemeClientImpl() override;
 
   // Implement ScrollbarThemeClient interface
   int x() const override;
   int y() const override;
   int width() const override;
   int height() const override;
   IntSize size() const override;
   IntPoint location() const override;
-  Widget* parent() const override;
-  Widget* root() const override;
+  FrameViewBase* parent() const override;
+  FrameViewBase* root() const override;
   void setFrameRect(const IntRect&) override;
   IntRect frameRect() const override;
   void invalidate() override;
   void invalidateRect(const IntRect&) override;
   ScrollbarOverlayColorTheme getScrollbarOverlayColorTheme() const override;
   void getTickmarks(Vector<IntRect>&) const override;
   bool isScrollableAreaActive() const override;
   IntPoint convertFromRootFrame(const IntPoint&) const override;
   bool isCustomScrollbar() const override;
   ScrollbarOrientation orientation() const override;
@@ skipping 14 matching lines @@
   float elasticOverscroll() const override;
   void setElasticOverscroll(float) override;
 
  private:
   WebScrollbar& m_scrollbar;
 };
 
 }  // namespace blink
 
 #endif  // WebScrollbarThemeClientImpl_h