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

webrtc/modules/video_render/windows/video_render_direct3d9.cc

 /*
  *  Copyright (c) 2012 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.
  */
 
@@ skipping 584 matching lines @@
     // Clear the backbuffer to a black color
     _pd3dDevice->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0, 0, 0), 1.0f,
                        0);
 
     // Begin the scene
     if (SUCCEEDED(_pd3dDevice->BeginScene()))
     {
         _pd3dDevice->SetStreamSource(0, _pVB, 0, sizeof(CUSTOMVERTEX));
         _pd3dDevice->SetFVF(D3DFVF_CUSTOMVERTEX);
 
-        D3DXMATRIX matWorld;
-        D3DXMATRIX matWorldTemp;
-
         //draw all the channels
         //get texture from the channels
         LPDIRECT3DTEXTURE9 textureFromChannel = NULL;
         DWORD textureWidth, textureHeight;
 
         std::multimap<int, unsigned int>::reverse_iterator it;
         it = _d3dZorder.rbegin();
         while (it != _d3dZorder.rend())
         {
             // loop through all channels and streams in Z order
@@ skipping 542 matching lines @@
                      "Direct3D render failed to find channel");
         return -1;
     }
     // Only allow one stream per channel, demuxing is
     ddobj->SetStreamSettings(0, zOrder, left, top, right, bottom);
 
     return 0;
 }
 
 }  // namespace webrtc