Add option in about:flags to disable Quickoffice component extension

chrome/browser/defaults.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 various defaults whose values varies depending upon the OS.
 
 #ifndef CHROME_BROWSER_DEFAULTS_H_
 #define CHROME_BROWSER_DEFAULTS_H_
 
 #include "build/build_config.h"
@@ skipping 76 matching lines @@
 // where we want the desktop to show through in this situation.
 extern const bool kAlwaysCreateTabbedBrowserOnSessionRestore;
 
 //=============================================================================
 // Runtime "const" - set only once after parsing command line option and should
 // never be modified after that.
 
 // Are bookmark enabled? True by default.
 extern bool bookmarks_enabled;
 
-// Whether Quick Office component extension is enabled.
-// True by default. This is only used by Chrome OS today.
-extern bool enable_component_quick_office;
-
 // Whether HelpApp is enabled. True by default. This is only used by Chrome OS
 // today.
 extern bool enable_help_app;
 
 }  // namespace browser_defaults
 
 #endif  // CHROME_BROWSER_DEFAULTS_H_