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

chrome/browser/ui/views/download/download_shelf_view.h

Index: chrome/browser/ui/views/download/download_shelf_view.h
diff --git a/chrome/browser/ui/views/download/download_shelf_view.h b/chrome/browser/ui/views/download/download_shelf_view.h
index da55a8a5867723dcc4a22b718a274fc9fcaf0e81..53ef5abc7779a037d2524e72a3412930325c1400 100644
--- a/chrome/browser/ui/views/download/download_shelf_view.h
+++ b/chrome/browser/ui/views/download/download_shelf_view.h
@@ -55,7 +55,7 @@ class DownloadShelfView : public views::AccessiblePaneView,
   virtual void ViewHierarchyChanged(bool is_add,
                                     View* parent,
                                     View* child) OVERRIDE;
-  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
+  virtual void OnPaint(gfx::CanvasSkia* canvas) OVERRIDE;
 
   // Implementation of ui::AnimationDelegate.
   virtual void AnimationProgressed(const ui::Animation* animation) OVERRIDE;
@@ -105,7 +105,7 @@ class DownloadShelfView : public views::AccessiblePaneView,
   void AddDownloadView(DownloadItemView* view);
 
   // Paints the border.
-  virtual void OnPaintBorder(gfx::Canvas* canvas) OVERRIDE;
+  virtual void OnPaintBorder(gfx::CanvasSkia* canvas) OVERRIDE;
 
   // Returns true if the shelf is wide enough to show the first download item.
   bool CanFitFirstDownloadItem();