ui/gfx: Make gfx::Canvas inherit from gfx::CanvasSkia.

chrome/browser/ui/views/dropdown_bar_view.h

Index: chrome/browser/ui/views/dropdown_bar_view.h
diff --git a/chrome/browser/ui/views/dropdown_bar_view.h b/chrome/browser/ui/views/dropdown_bar_view.h
index 635f0a61d1fc15eba8dab29d611f13c258ab1be8..6c2b36d563153b04f05d085a45d492a1f30fc33e 100644
--- a/chrome/browser/ui/views/dropdown_bar_view.h
+++ b/chrome/browser/ui/views/dropdown_bar_view.h
@@ -11,8 +11,8 @@
 #include "ui/views/accessible_pane_view.h"
 
 namespace gfx {
-class Canvas;
-}  // namespace gfx
+class CanvasSkia;
+}
 
 ////////////////////////////////////////////////////////////////////////////////
 //
@@ -35,7 +35,7 @@ class DropdownBarView : public views::AccessiblePaneView,
 
  protected:
   // views::View:
-  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
+  virtual void OnPaint(gfx::CanvasSkia* canvas) OVERRIDE;
 
   // Returns the DropdownBarHost that manages this view.
   DropdownBarHost* host() const { return host_; }