Set linux distro to CHROMEOS_RELEASE_DESCRIPTION on ChromeOS

chrome/browser/ui/webui/help/help_handler.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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_HELP_HELP_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_HELP_HELP_HANDLER_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 52 matching lines @@
   void SetUpdateStatus(VersionUpdater::Status status, int progress,
                        const string16& fail_message);
 
 #if defined(OS_MACOSX)
   // Callback method which forwards promotion state to the page.
   void SetPromotionState(VersionUpdater::PromotionState state);
 #endif
 
 #if defined(OS_CHROMEOS)
   // Callbacks from VersionLoader.
-  void OnOSVersion(chromeos::VersionLoader::Handle handle, std::string version);
+  void OnOSVersion(chromeos::VersionLoader::Handle handle,
+                   const std::string& version);
   void OnOSFirmware(chromeos::VersionLoader::Handle handle,
-                    std::string firmware);
+                    const std::string& firmware);
   void OnReleaseChannel(const std::string& channel);
 
   void ProcessLsbFileInfo(
       base::PlatformFileError rv, const base::PlatformFileInfo& file_info);
 #endif
 
   // Specialized instance of the VersionUpdater used to update the browser.
   scoped_ptr<VersionUpdater> version_updater_;
 
   // Used for callbacks.
   base::WeakPtrFactory<HelpHandler> weak_factory_;
 
   // Used to observe notifications.
   content::NotificationRegistrar registrar_;
 
 #if defined(OS_CHROMEOS)
   // Handles asynchronously loading the CrOS version info.
   chromeos::VersionLoader loader_;
 
   // Used to request the version.
   CancelableRequestConsumer consumer_;
 #endif  // defined(OS_CHROMEOS)
 
   DISALLOW_COPY_AND_ASSIGN(HelpHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_HELP_HELP_HANDLER_H_