Remove RenderWidget::SetBackground, change IPC to pass a bool.

content/renderer/render_widget.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_RENDER_WIDGET_H_
 #define CONTENT_RENDERER_RENDER_WIDGET_H_
 
 #include <deque>
 #include <map>
 
@@ skipping 289 matching lines @@
   // a RenderWidget in a different process.  If so, no new IPC messages will be
   // sent (only ACKs) and the process is free to exit when there are no other
   // active RenderWidgets.
   void SetSwappedOut(bool is_swapped_out);
 
   void InvalidationCallback();
   void FlushPendingInputEventAck();
   void DoDeferredClose();
   void DoDeferredSetWindowRect(const blink::WebRect& pos);
 
-  // Set the background of the render widget to a bitmap. The bitmap will be
-  // tiled in both directions if it isn't big enough to fill the area. This is
-  // mainly intended to be used in conjuction with WebView::SetIsTransparent().
-  virtual void SetBackground(const SkBitmap& bitmap);
-
   // Resizes the render widget.
   void Resize(const gfx::Size& new_size,
               const gfx::Size& physical_backing_size,
               float overdraw_bottom_height,
               const gfx::Size& visible_viewport_size,
               const gfx::Rect& resizer_rect,
               bool is_fullscreen,
               ResizeAck resize_ack);
   // Used to force the size of a window when running layout tests.
   void ResizeSynchronously(const gfx::Rect& new_position);
@@ skipping 301 matching lines @@
   // Stores the current composition range.
   gfx::Range composition_range_;
 
   // The kind of popup this widget represents, NONE if not a popup.
   blink::WebPopupType popup_type_;
 
   // Holds all the needed plugin window moves for a scroll.
   typedef std::vector<WebPluginGeometry> WebPluginGeometryVector;
   WebPluginGeometryVector plugin_window_moves_;
 
-  // A custom background for the widget.
-  SkBitmap background_;
-
   // While we are waiting for the browser to update window sizes, we track the
   // pending size temporarily.
   int pending_window_rect_count_;
   blink::WebRect pending_window_rect_;
 
   // The screen rects of the view and the window that contains it.
   gfx::Rect view_screen_rect_;
   gfx::Rect window_screen_rect_;
 
   scoped_ptr<IPC::Message> pending_input_event_ack_;
@@ skipping 69 matching lines @@
 
   ui::MenuSourceType context_menu_source_type_;
   gfx::Point touch_editing_context_menu_location_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidget);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_WIDGET_H_