Rename WebKit namespace to blink (part 3)

content/public/renderer/history_item_serialization.h

 // Copyright (c) 2013 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 CONTENT_RENDERER_HISTORY_ITEM_SERIALIZATION_H_
 #define CONTENT_RENDERER_HISTORY_ITEM_SERIALIZATION_H_
 
 #include <string>
 
 #include "content/common/content_export.h"
 
-namespace WebKit {
+namespace blink {
 class WebHistoryItem;
 }
 
 namespace content {
 class PageState;
 
 CONTENT_EXPORT PageState HistoryItemToPageState(
-    const WebKit::WebHistoryItem& item);
-CONTENT_EXPORT WebKit::WebHistoryItem PageStateToHistoryItem(
+    const blink::WebHistoryItem& item);
+CONTENT_EXPORT blink::WebHistoryItem PageStateToHistoryItem(
     const PageState& state);
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_HISTORY_ITEM_SERIALIZATION_H_