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

BUG=webrtc:3667

Review URL: https://codereview.webrtc.org/1232713002

Cr-Commit-Position: refs/heads/master@{#9576}

AUTHORS

@@ -32,6 +32,7 @@ Vicken Simonian <vsimon@gmail.com>
 Victor Costan <costan@gmail.com>
 
 ARM Holdings
+BroadSoft Inc.
 Google Inc.
 Intel Corporation
 MIPS Technologies

webrtc/modules/video_render/windows/video_render_direct3d9.cc

@@ -602,9 +602,6 @@ int VideoRenderDirect3D9::UpdateRenderSurface()
         _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;

webrtc/modules/video_render/windows/video_render_direct3d9.h

@@ -14,7 +14,6 @@
 #include "webrtc/modules/video_render/windows/i_video_render_win.h"
 
 #include <d3d9.h>
-#include <d3dx9.h>
 #include <ddraw.h>
 
 #include <Map>