Move a bunch of content\common code into the content namespace.

content/common/gpu/media/rendering_helper_mac.mm

 // 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.
 
 #include "content/common/gpu/media/rendering_helper.h"
 
 #import <Cocoa/Cocoa.h>
 #import <OpenGL/gl.h>
 #import <OpenGL/CGLMacro.h>
 
@@ skipping 60 matching lines @@
 
   glBindTexture(GL_TEXTURE_RECTANGLE_ARB, 0);
   glDisable(GL_TEXTURE_RECTANGLE_ARB);
 
   if (!suppress_swap_to_display)
     [[gl_view openGLContext] flushBuffer];
   [gl_view unlockFocus];
   CHECK_EQ(static_cast<int>(glGetError()), GL_NO_ERROR);
 }
 
-namespace video_test_util {
+namespace content {
 
 class RenderingHelperMac : public RenderingHelper {
  public:
   RenderingHelperMac();
   virtual ~RenderingHelperMac();
 
   // Implement RenderingHelper.
   virtual void Initialize(bool suppress_swap_to_display,
                           int num_windows,
                           int width,
@@ skipping 120 matching lines @@
 }
 
 void* RenderingHelperMac::GetGLContext() {
   return GetCGLContext(gl_view_);
 }
 
 void* RenderingHelperMac::GetGLDisplay() {
   return NULL;
 }
 
-}  // namespace video_test_util
+}  // namespace content