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

chrome/browser/chromeos/login/chrome_restart_request.cc

 // Copyright 2013 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 "chrome/browser/chromeos/login/chrome_restart_request.h"
 
 #include <vector>
 
 #include "ash/ash_switches.h"
 #include "base/command_line.h"
@@ skipping 61 matching lines @@
   static const char* kForwardSwitches[] = {
     ::switches::kDisableAccelerated2dCanvas,
     ::switches::kDisableAcceleratedOverflowScroll,
     ::switches::kDisableAcceleratedVideoDecode,
     ::switches::kDisableDelegatedRenderer,
     ::switches::kDisableDistanceFieldText,
     ::switches::kDisableFastTextAutosizing,
     ::switches::kDisableFiltersOverIPC,
     ::switches::kDisableGpuShaderDiskCache,
     ::switches::kDisableGpuWatchdog,
-    ::switches::kDisableGpuCompositing,
     ::switches::kDisableGpuRasterization,
     ::switches::kDisableImplSidePainting,
     ::switches::kDisableLowResTiling,
     ::switches::kDisableMediaSource,
     ::switches::kDisablePrefixedEncryptedMedia,
     ::switches::kDisablePanelFitting,
     ::switches::kDisableRepaintAfterLayout,
     ::switches::kDisableSeccompFilterSandbox,
     ::switches::kDisableSetuidSandbox,
     ::switches::kDisableThreadedCompositing,
@@ skipping 285 matching lines @@
     // Relaunch chrome without session manager on dev box.
     ReLaunch(command_line);
     return;
   }
 
   // ChromeRestartRequest deletes itself after request sent to session manager.
   (new ChromeRestartRequest(command_line))->Start();
 }
 
 }  // namespace chromeos