Set linux distro to CHROMEOS_RELEASE_DESCRIPTION on ChromeOS

chrome/browser/ui/webui/help/help_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/ui/webui/help/help_handler.h"
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
@@ skipping 375 matching lines @@
   }
 
   scoped_ptr<Value> state_value(Value::CreateStringValue(state_str));
   web_ui()->CallJavascriptFunction("help.HelpPage.setPromotionState",
                                    *state_value);
 }
 #endif  // defined(OS_MACOSX)
 
 #if defined(OS_CHROMEOS)
 void HelpHandler::OnOSVersion(chromeos::VersionLoader::Handle handle,
-                              std::string version) {
+                              const std::string& version) {
   scoped_ptr<Value> version_string(Value::CreateStringValue(version));
   web_ui()->CallJavascriptFunction("help.HelpPage.setOSVersion",
                                    *version_string);
 }
 
 void HelpHandler::OnOSFirmware(chromeos::VersionLoader::Handle handle,
-                               std::string firmware) {
+                               const std::string& firmware) {
   scoped_ptr<Value> firmware_string(Value::CreateStringValue(firmware));
   web_ui()->CallJavascriptFunction("help.HelpPage.setOSFirmware",
                                    *firmware_string);
 }
 
 void HelpHandler::OnReleaseChannel(const std::string& channel) {
   scoped_ptr<Value> channel_string(Value::CreateStringValue(channel));
   web_ui()->CallJavascriptFunction(
       "help.HelpPage.updateSelectedChannel", *channel_string);
 }
@@ skipping 19 matching lines @@
 
     // Note that this string will be internationalized.
     string16 build_date = base::TimeFormatFriendlyDate(time);
     g_build_date_string = Value::CreateStringValue(build_date);
   }
 
   web_ui()->CallJavascriptFunction("help.HelpPage.setBuildDate",
                                    *g_build_date_string);
 }
 #endif // defined(OS_CHROMEOS)