Fixed a rendering glitch with window borders for Aura on Windows.

content/browser/renderer_host/software_output_device_win.h

 // Copyright (c) 2013 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_BROWSER_RENDERER_HOST_SOFTWARE_OUTPUT_DEVICE_WIN_H_
 #define CONTENT_BROWSER_RENDERER_HOST_SOFTWARE_OUTPUT_DEVICE_WIN_H_
 
 #include "cc/output/software_output_device.h"
 
 #include <windows.h>
 
 namespace ui {
 class Compositor;
 }
 
 namespace content {
 
 class SoftwareOutputDeviceWin : public cc::SoftwareOutputDevice {
  public:
   explicit SoftwareOutputDeviceWin(ui::Compositor* compositor);
 
   virtual ~SoftwareOutputDeviceWin();
 
   virtual void Resize(gfx::Size viewport_size) OVERRIDE;
 
   virtual void EndPaint(cc::SoftwareFrameData* frame_data) OVERRIDE;
 
  private:
   ui::Compositor* compositor_;
-  HDC hdc_;
+  HWND hwnd_;
   BITMAPINFO bitmap_info_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_SOFTWARE_OUTPUT_DEVICE_WIN_H_