intents: Change default_service_url() to return a const-ref.

chrome/browser/ui/intents/web_intent_picker_model.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_INTENTS_WEB_INTENT_PICKER_MODEL_H_
 #define CHROME_BROWSER_UI_INTENTS_WEB_INTENT_PICKER_MODEL_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 58 matching lines @@
   void set_observer(WebIntentPickerModelObserver* observer) {
     observer_ = observer;
   }
 
   const string16& action() const { return action_; }
   void set_action(const string16& action) { action_ = action; }
 
   const string16& type() const { return type_; }
   void set_type(const string16& type) { type_ = type; }
 
-  GURL default_service_url() const { return default_service_url_; }
+  const GURL& default_service_url() const { return default_service_url_; }
   void set_default_service_url(const GURL& default_url) {
     default_service_url_ = default_url;
   }
 
   int64 default_service_hash() const { return default_service_hash_; }
   void set_default_service_hash(int64 default_service_hash) {
     default_service_hash_ = default_service_hash;
   }
 
   // Add a new installed service with |title|, |url| and |disposition| to the
@@ skipping 130 matching lines @@
 
   // Information about the pending extension install.
   std::string pending_extension_install_id_;
   int pending_extension_install_download_progress_;
   string16 pending_extension_install_status_string_;
 
   DISALLOW_COPY_AND_ASSIGN(WebIntentPickerModel);
 };
 
 #endif  // CHROME_BROWSER_UI_INTENTS_WEB_INTENT_PICKER_MODEL_H_