Enable shadow DOM-based "missing plugin" placeholder.

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 90 matching lines @@
     ::switches::kDisableGpuSandbox,
     ::switches::kEnableContainerCulling,
     ::switches::kEnableTextBlobs,
     ::switches::kEnableDistanceFieldText,
     ::switches::kEnableGpuRasterization,
     ::switches::kEnableImplSidePainting,
     ::switches::kEnableLogging,
     ::switches::kEnableLowResTiling,
     ::switches::kEnableOneCopy,
     ::switches::kEnablePinch,
+    ::switches::kEnablePluginPlaceholderShadowDom,
     ::switches::kEnableTouchDragDrop,
     ::switches::kEnableTouchEditing,
     ::switches::kEnableViewport,
     ::switches::kEnableViewportMeta,
     ::switches::kEnableZeroCopy,
     ::switches::kMainFrameResizesAreOrientationChanges,
     ::switches::kForceDeviceScaleFactor,
     ::switches::kForceGpuRasterization,
     ::switches::kGpuStartupDialog,
     ::switches::kGpuSandboxAllowSysVShm,
@@ skipping 249 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