Move Render(View|Widget)Host and associated classes to content namespace.

chrome/browser/chrome_browser_application_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.
 
 #import "chrome/browser/chrome_browser_application_mac.h"
 
 #import "base/logging.h"
 #include "base/mac/crash_logging.h"
 #import "base/mac/scoped_nsexception_enabler.h"
 #import "base/memory/scoped_nsobject.h"
@@ skipping 460 matching lines @@
 }
 
 - (void)accessibilitySetValue:(id)value forAttribute:(NSString*)attribute {
   if ([attribute isEqualToString:@"AXEnhancedUserInterface"] &&
       [value intValue] == 1) {
     BrowserAccessibilityState::GetInstance()->OnScreenReaderDetected();
     for (TabContentsIterator it;
          !it.done();
          ++it) {
       if (TabContentsWrapper* contents = *it) {
-        if (RenderViewHost* rvh =
+        if (content::RenderViewHost* rvh =
                 contents->web_contents()->GetRenderViewHost()) {
           rvh->EnableRendererAccessibility();
         }
       }
     }
   }
   return [super accessibilitySetValue:value forAttribute:attribute];
 }
 
 @end