Change Clipboard to use virtual methods for testing purposes.

ui/base/clipboard/clipboard.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 "ui/base/clipboard/clipboard.h"
 
 #include <iterator>
 #include <limits>
 
 #include "base/lazy_instance.h"
@@ skipping 70 matching lines @@
     }
 
     DCHECK(found);
   }
 
   ClipboardMap* clipboard_map = g_clipboard_map.Pointer();
   ClipboardMap::iterator it = clipboard_map->find(id);
   if (it != clipboard_map->end())
     return it->second;
 
-  Clipboard* clipboard = new ui::Clipboard;
+  Clipboard* clipboard = Clipboard::Create();
   clipboard_map->insert(std::make_pair(id, clipboard));
   return clipboard;
 }
 
 void Clipboard::DestroyClipboardForCurrentThread() {
   base::AutoLock lock(g_clipboard_map_lock.Get());
 
   ClipboardMap* clipboard_map = g_clipboard_map.Pointer();
   base::PlatformThreadId id = base::PlatformThread::CurrentId();
   ClipboardMap::iterator it = clipboard_map->find(id);
@@ skipping 122 matching lines @@
       iter->second[0].clear();
       for (size_t i = 0; i < sizeof(SharedMemory*); ++i)
         iter->second[0].push_back(reinterpret_cast<char*>(&bitmap)[i]);
       has_shared_bitmap = true;
     }
   }
   return true;
 }
 
 }  // namespace ui