Add the --disable-off-store-extension-install switch.

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_
 #pragma once
 
@@ skipping 80 matching lines @@
 extern const char kDisableExtensions[];
 extern const char kDisableFlashSandbox[];
 extern const char kDisableHistoryQuickProvider[];
 extern const char kDisableHistoryURLProvider[];
 extern const char kDisableImprovedDownloadProtection[];
 extern const char kDisableInternalFlash[];
 extern const char kDisableIPv6[];
 extern const char kDisableIPPooling[];
 extern const char kDisableNTPOtherSessionsMenu[];
 extern const char kDisableLoginAnimations[];
+extern const char kDisableOffStoreExtensionInstall[];
 extern const char kDisablePreconnect[];
 extern const char kDisablePromptOnRepost[];
 extern const char kDisableRestoreBackgroundContents[];
 extern const char kDisableRestoreSessionState[];
 extern const char kDisableShortcutsProvider[];
 extern const char kDisableSSL3[];
 extern const char kDisableSync[];
 extern const char kDisableSyncAppSettings[];
 extern const char kDisableSyncApps[];
 extern const char kDisableSyncAppNotifications[];
@@ skipping 301 matching lines @@
 #else
 extern const char kEnablePrintPreview[];
 #endif
 
 // 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_