Only allow installation of extensions/apps with gallery update url via download from gallery

chrome/common/chrome_switches.h

 // Copyright (c) 2010 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 10 matching lines @@
 // alongside the definition of their values in the .cc file.
 extern const char kActivateOnLaunch[];
 extern const char kAllowFileAccessFromFiles[];
 extern const char kAllowSandboxDebugging[];
 extern const char kAlwaysEnableDevTools[];
 extern const char kApp[];
 extern const char kAppId[];
 extern const char kAppLaunchAsPanel[];
 extern const char kAppsDebug[];
 extern const char kAppsPanel[];
-extern const char kAppsGalleryTitle[];
 extern const char kAppsGalleryURL[];
 extern const char kAppsNoThrob[];
 extern const char kAuthServerWhitelist[];
 extern const char kAutomationClientChannelID[];
 extern const char kBookmarkMenu[];
 extern const char kBrowserAssertTest[];
 extern const char kBrowserCrashTest[];
 extern const char kBrowserSubprocessPath[];
 extern const char kChromeFrame[];
 extern const char kCloudPrintProxyId[];
@@ skipping 263 matching lines @@
 #endif
 // Return true if the switches indicate the seccomp sandbox is enabled.
 bool SeccompSandboxEnabled();
 
 // 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_