Revert of Plugins: Remove Shadow DOM Plugin Placeholder

chrome/common/chrome_switches.h

 // 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.
 
 // Defines all the command-line switches used by Chrome.
 
 #ifndef CHROME_COMMON_CHROME_SWITCHES_H_
 #define CHROME_COMMON_CHROME_SWITCHES_H_
 
 #include "build/build_config.h"
@@ skipping 123 matching lines @@
 extern const char kEnableNaCl[];
 extern const char kEnableNavigationTracing[];
 extern const char kEnableNetBenchmarking[];
 extern const char kEnableNewBookmarkApps[];
 extern const char kEnableNTPPopularSites[];
 extern const char kEnableOfflineAutoReload[];
 extern const char kEnableOfflineAutoReloadVisibleOnly[];
 extern const char kEnablePanels[];
 extern const char kEnablePdfMaterialUI[];
 extern const char kEnablePermissionsBubbles[];
+extern const char kEnablePluginPlaceholderShadowDom[];
 extern const char kEnablePotentiallyAnnoyingSecurityFeatures[];
 extern const char kEnablePowerOverlay[];
 extern const char kEnablePrintPreviewRegisterPromos[];
 extern const char kEnableProfiling[];
 extern const char kEnableQuic[];
 extern const char kEnableQuicPortSelection[];
 extern const char kEnableSavePasswordBubble[];
 extern const char kEnableSdchPersistence[];
 extern const char kEnableSessionCrashedBubble[];
 extern const char kEnableSettingsWindow[];
@@ skipping 268 matching lines @@
 #if defined(ENABLE_TASK_MANAGER)
 bool NewTaskManagerEnabled();
 #endif  // defined(ENABLE_TASK_MANAGER)
 
 // DON'T ADD RANDOM STUFF HERE. Put it in the main section above in
 // alphabetical order, or in one of the ifdefs (also in order in each section).
 
 }  // namespace switches
 
 #endif  // CHROME_COMMON_CHROME_SWITCHES_H_