Use a direct include of strings headers in webkit/, part 2.

webkit/support/mock_webclipboard_impl.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.
 //
 // This file mocks out just enough of the WebClipboard API for running the
 // webkit tests. This is so we can run webkit tests without them sharing a
 // clipboard, which allows for running them in parallel and having the tests
 // not interact with actual user actions.
 
 #ifndef WEBKIT_SUPPORT_MOCK_WEBCLIPBOARD_IMPL_H_
 #define WEBKIT_SUPPORT_MOCK_WEBCLIPBOARD_IMPL_H_
 
 #include <map>
 
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "third_party/WebKit/public/platform/WebClipboard.h"
 #include "third_party/WebKit/public/platform/WebDragData.h"
 #include "third_party/WebKit/public/platform/WebImage.h"
 
 class MockWebClipboardImpl : public WebKit::WebClipboard {
  public:
   MockWebClipboardImpl();
   virtual ~MockWebClipboardImpl();
 
   virtual bool isFormatAvailable(WebKit::WebClipboard::Format format,
@@ skipping 25 matching lines @@
   void clear();
 
   WebKit::WebString m_plainText;
   WebKit::WebString m_htmlText;
   WebKit::WebImage m_image;
   std::map<base::string16, base::string16> m_customData;
   bool m_writeSmartPaste;
 };
 
 #endif  // WEBKIT_SUPPORT_MOCK_WEBCLIPBOARD_IMPL_H_