Removed unused variables and the need to include the d3dx9.h file.

webrtc/modules/video_render/windows/video_render_direct3d9.h

 /*
  *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #ifndef WEBRTC_MODULES_VIDEO_RENDER_MAIN_SOURCE_WINDOWS_VIDEO_RENDER_DIRECT3D9_H_
 #define WEBRTC_MODULES_VIDEO_RENDER_MAIN_SOURCE_WINDOWS_VIDEO_RENDER_DIRECT3D9_H_
 
 #include "webrtc/modules/video_render/windows/i_video_render_win.h"
 
 #include <d3d9.h>
+#if _MSC_VER < 1800

[Peter Kasting, 2015/07/10 23:37:26]

Why does the MSVC version matter?  If what you're concerned about is whether the
user has an older Windows/DirectX SDK installed, that's unrelated to the MSVC
version.

 #include <d3dx9.h>
+#endif
 #include <ddraw.h>
 
 #include <Map>
 
 // Added
 #include "webrtc/modules/video_render/include/video_render_defines.h"
 #include "webrtc/system_wrappers/interface/thread_wrapper.h"
 
 #pragma comment(lib, "d3d9.lib")       // located in DirectX SDK
 
@@ skipping 217 matching lines @@
                             float stopWidth, float stopHeight);
 
     //code for providing graphics settings
     DWORD _totalMemory;
     DWORD _availableMemory;
 };
 
 }  // namespace webrtc
 
 #endif // WEBRTC_MODULES_VIDEO_RENDER_MAIN_SOURCE_WINDOWS_VIDEO_RENDER_DIRECT3D9_H_