Add chrome://quit to shut down Chrome, including packaged apps.

chrome/browser/browser_about_handler.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/browser_about_handler.h"
 
 #include <string>
 
 #include "base/logging.h"
 #include "base/strings/string_util.h"
@@ skipping 52 matching lines @@
     path = chrome::kChromeUISettingsHost + url->path();
   // Redirect chrome://help
   } else if (host == chrome::kChromeUIHelpHost) {
     host = chrome::kChromeUIUberHost;
     path = chrome::kChromeUIHelpHost + url->path();
   } else if (host == chrome::kChromeUIRestartHost) {
     // Call AttemptRestart after chrome::Navigate() completes to avoid access of
     // gtk objects after they are destoyed by BrowserWindowGtk::Close().
     base::MessageLoop::current()->PostTask(FROM_HERE,
         base::Bind(&chrome::AttemptRestart));
+  } else if (host == chrome::kChromeUIQuitHost) {
+    base::MessageLoop::current()->PostTask(FROM_HERE,
+        base::Bind(&chrome::AttemptExit));
   }
 
   GURL::Replacements replacements;
   replacements.SetHostStr(host);
   if (!path.empty())
     replacements.SetPathStr(path);
   *url = url->ReplaceComponents(replacements);
 
   // Having re-written the URL, make the chrome: handler process it.
   return false;
 }
 
 bool HandleNonNavigationAboutURL(const GURL& url) {
   // chrome://ipc/ is currently buggy, so we disable it for official builds.
 #if !defined(OFFICIAL_BUILD)
 
 #if (defined(OS_MACOSX) || defined(OS_WIN)) && defined(IPC_MESSAGE_LOG_ENABLED)
   if (LowerCaseEqualsASCII(url.spec(), chrome::kChromeUIIPCURL)) {
     // Run the dialog. This will re-use the existing one if it's already up.
     chrome::ShowAboutIPCDialog();
     return true;
   }
 #endif
 
 #endif  // OFFICIAL_BUILD
 
   return false;
 }