Clean up frame code a bit:

ui/views/window/frame_background.h

Index: ui/views/window/frame_background.h
diff --git a/ui/views/window/frame_background.h b/ui/views/window/frame_background.h
index c2278c10c9694728de064ad2b7040ae248275714..757b6d4b32473d90bce122185f31352b17692608 100644
--- a/ui/views/window/frame_background.h
+++ b/ui/views/window/frame_background.h
@@ -64,15 +64,15 @@ class VIEWS_EXPORT FrameBackground {
   // Paints the border for a standard, non-maximized window.  Also paints the
   // background of the title bar area, since the top frame border and the
   // title bar background are a contiguous component.
-  void PaintRestored(gfx::Canvas* canvas, View* view) const;
+  void PaintRestored(gfx::Canvas* canvas, const View* view) const;
 
   // Paints the border for a maximized window, which does not include the
   // window edges.
-  void PaintMaximized(gfx::Canvas* canvas, View* view) const;
+  void PaintMaximized(gfx::Canvas* canvas, const View* view) const;
 
  private:
   // Fills the frame area with the frame color.
-  void PaintFrameColor(gfx::Canvas* canvas, View* view) const;
+  void PaintFrameColor(gfx::Canvas* canvas, const View* view) const;
 
   SkColor frame_color_;
   const gfx::ImageSkia* theme_image_;