chrome: Add out-of-line copy ctors for complex classes.

chrome/browser/profiles/avatar_menu.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_PROFILES_AVATAR_MENU_H_
 #define CHROME_BROWSER_PROFILES_AVATAR_MENU_H_
 
 #include <stddef.h>
 
 #include <string>
@@ skipping 30 matching lines @@
 // back to it in response to user events.
 class AvatarMenu :
 #if defined(ENABLE_SUPERVISED_USERS)
     public SupervisedUserServiceObserver,
 #endif
     public ProfileInfoCacheObserver {
  public:
   // Represents an item in the menu.
   struct Item {
     Item(size_t menu_index, size_t profile_index, const gfx::Image& icon);
+    Item(const Item& other);
     ~Item();
 
     // The icon to be displayed next to the item.
     gfx::Image icon;
 
     // Whether or not the current browser is using this profile.
     bool active;
 
     // The name of this profile.
     base::string16 name;
@@ skipping 130 matching lines @@
   // The observer of this model, which is notified of changes. Weak.
   AvatarMenuObserver* observer_;
 
   // Browser in which this avatar menu resides. Weak.
   Browser* browser_;
 
   DISALLOW_COPY_AND_ASSIGN(AvatarMenu);
 };
 
 #endif  // CHROME_BROWSER_PROFILES_AVATAR_MENU_H_