aura: Remove old GL paths from RenderWidgetHostViewAura.

content/shell/app/shell_main_delegate.cc

 // 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/shell/app/shell_main_delegate.h"
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/files/file.h"
 #include "base/files/file_path.h"
@@ skipping 152 matching lines @@
       command_line.AppendSwitch(switches::kDisableThreadedCompositing);
       command_line.AppendSwitch(cc::switches::kDisableThreadedAnimation);
     }
 
     command_line.AppendSwitch(switches::kEnableInbandTextTracks);
     command_line.AppendSwitch(switches::kMuteAudio);
 
 #if defined(USE_AURA)
     // TODO: crbug.com/311404 Make layout tests work w/ delegated renderer.
     command_line.AppendSwitch(switches::kDisableDelegatedRenderer);
+    command_line.AppendSwitch(cc::switches::kCompositeToMailbox);
 #endif
 
     command_line.AppendSwitch(switches::kEnableFileCookies);
 
     // Unless/until WebM files are added to the media layout tests, we need to
     // avoid removing MP4/H264/AAC so that layout tests can run on Android.
 #if !defined(OS_ANDROID)
     net::RemoveProprietaryMediaTypesAndCodecsForTests();
 #endif
 
@@ skipping 108 matching lines @@
   browser_client_.reset(new ShellContentBrowserClient);
   return browser_client_.get();
 }
 
 ContentRendererClient* ShellMainDelegate::CreateContentRendererClient() {
   renderer_client_.reset(new ShellContentRendererClient);
   return renderer_client_.get();
 }
 
 }  // namespace content