Revert of Don't expose --disable-gpu-compositing, only set internally.

content/browser/renderer_host/render_process_host_impl.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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "content/browser/renderer_host/render_process_host_impl.h"
 
 #include <algorithm>
@@ skipping 1020 matching lines @@
     switches::kDisableBreakpad,
     switches::kDisableCompositingForFixedPosition,
     switches::kDisableCompositingForTransition,
     switches::kDisableDatabases,
     switches::kDisableDesktopNotifications,
     switches::kDisableDirectNPAPIRequests,
     switches::kDisableDistanceFieldText,
     switches::kDisableFastTextAutosizing,
     switches::kDisableFileSystem,
     switches::kDisableFiltersOverIPC,
+    switches::kDisableGpuCompositing,
     switches::kDisableGpuVsync,
     switches::kDisableLowResTiling,
     switches::kDisableHistogramCustomizer,
     switches::kDisableLCDText,
     switches::kDisableLayerSquashing,
     switches::kDisableLocalStorage,
     switches::kDisableLogging,
     switches::kDisableMediaSource,
     switches::kDisableOverlayScrollbar,
     switches::kDisablePinch,
@@ skipping 1022 matching lines @@
     mojo::ScopedMessagePipeHandle handle) {
   mojo_activation_required_ = true;
   MaybeActivateMojo();
 
   mojo::AllocationScope scope;
   mojo_application_host_->shell_client()->AcceptConnection(service_name,
                                                            handle.Pass());
 }
 
 }  // namespace content