Cleanup return values in chrome/browser/ui/passwords

chrome/browser/ui/passwords/manage_passwords_ui_controller.h

 // Copyright 2014 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_PASSWORDS_MANAGE_PASSWORDS_UI_CONTROLLER_H_
 #define CHROME_BROWSER_UI_PASSWORDS_MANAGE_PASSWORDS_UI_CONTROLLER_H_
 
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_vector.h"
 #include "base/timer/elapsed_timer.h"
@@ skipping 76 matching lines @@
   // Set the state of the Omnibox icon, and possibly show the associated bubble
   // without user interaction.
   virtual void UpdateIconAndBubbleState(ManagePasswordsIcon* icon);
 
   password_manager::ui::State state() const { return state_; }
 
   // True if a password is sitting around, waiting for a user to decide whether
   // or not to save it.
   bool PasswordPendingUserDecision() const;
 
-  const autofill::ConstPasswordFormMap best_matches() const {
+  const autofill::ConstPasswordFormMap& best_matches() const {
     return password_form_map_;
   }
 
   const GURL& origin() const { return origin_; }
 
  protected:
   explicit ManagePasswordsUIController(
       content::WebContents* web_contents);
 
   // The pieces of saving and blacklisting passwords that interact with
@@ skipping 52 matching lines @@
 
   // The origin of the form we're currently dealing with; we'll use this to
   // determine which PasswordStore changes we should care about when updating
   // |password_form_map_|.
   GURL origin_;
 
   DISALLOW_COPY_AND_ASSIGN(ManagePasswordsUIController);
 };
 
 #endif  // CHROME_BROWSER_UI_PASSWORDS_MANAGE_PASSWORDS_UI_CONTROLLER_H_