Move unique name generation and tracking into //content.

third_party/WebKit/public/web/WebHistoryItem.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef WebHistoryItem_h
 #define WebHistoryItem_h
 
 #include "../platform/WebCommon.h"
 #include "../platform/WebHistoryScrollRestorationType.h"
 #include "../platform/WebPrivatePtr.h"
 #include "../platform/WebReferrerPolicy.h"
+#include "public/platform/WebString.h"
 
 namespace blink {
 
 class HistoryItem;
 class WebHTTPBody;
 class WebString;
 class WebSerializedScriptValue;
 struct WebFloatPoint;
 struct WebPoint;
 template <typename T>
@@ skipping 26 matching lines @@
 
   bool isNull() const { return m_private.isNull(); }
 
   BLINK_EXPORT WebString urlString() const;
   BLINK_EXPORT void setURLString(const WebString&);
 
   BLINK_EXPORT WebString referrer() const;
   BLINK_EXPORT WebReferrerPolicy getReferrerPolicy() const;
   BLINK_EXPORT void setReferrer(const WebString&, WebReferrerPolicy);
 
-  BLINK_EXPORT WebString target() const;
+  BLINK_EXPORT const WebString& target() const;
   BLINK_EXPORT void setTarget(const WebString&);
 
   BLINK_EXPORT WebFloatPoint visualViewportScrollOffset() const;
   BLINK_EXPORT void setVisualViewportScrollOffset(const WebFloatPoint&);
 
   BLINK_EXPORT WebPoint getScrollOffset() const;
   BLINK_EXPORT void setScrollOffset(const WebPoint&);
 
   BLINK_EXPORT float pageScaleFactor() const;
   BLINK_EXPORT void setPageScaleFactor(float);
@@ skipping 25 matching lines @@
   BLINK_EXPORT void setDidSaveScrollOrScaleState(bool);
 
 #if BLINK_IMPLEMENTATION
   BLINK_EXPORT WebHistoryItem(HistoryItem*);
   BLINK_EXPORT WebHistoryItem& operator=(HistoryItem*);
   BLINK_EXPORT operator HistoryItem*() const;
 #endif
 
  private:
   WebPrivatePtr<HistoryItem> m_private;
+  // TODO(dcheng): Remove this, since unique name is no longer a Blink concept.
+  WebString m_target;
 };
 
 }  // namespace blink
 
 #endif