Add flag in about:flags page to enable / disable apps-devtool.

chrome/browser/extensions/component_loader.cc

 // 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.
 
 #include "chrome/browser/extensions/component_loader.h"
 
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/json/json_string_value_serializer.h"
 #include "base/path_service.h"
@@ skipping 366 matching lines @@
   // Component extensions with background pages are not enabled during tests
   // because they generate a lot of background behavior that can interfere.
   if (!enable_background_extensions_during_testing &&
       command_line->HasSwitch(switches::kTestType)) {
     return;
   }
 
   if (!skip_session_components) {
     // Apps Debugger
     if (CommandLine::ForCurrentProcess()->HasSwitch(
-        switches::kAppsDebugger)) {
+        switches::kAppsDevtool)) {
       Add(IDR_APPS_DEBUGGER_MANIFEST,
           base::FilePath(FILE_PATH_LITERAL("apps_debugger")));
     }
 
     AddFileManagerExtension();
 
 #if defined(ENABLE_SETTINGS_APP)
     Add(IDR_SETTINGS_APP_MANIFEST,
         base::FilePath(FILE_PATH_LITERAL("settings_app")));
 #endif
@@ skipping 43 matching lines @@
 void ComponentLoader::RegisterUserPrefs(PrefRegistrySyncable* registry) {
   registry->RegisterStringPref(prefs::kEnterpriseWebStoreURL,
                                std::string() /* default_value */,
                                PrefRegistrySyncable::UNSYNCABLE_PREF);
   registry->RegisterStringPref(prefs::kEnterpriseWebStoreName,
                                std::string() /* default_value */,
                                PrefRegistrySyncable::UNSYNCABLE_PREF);
 }
 
 }  // namespace extensions