First fix to minimize copying of image data.

chrome/browser/dom_ui/history_ui.h

 // Copyright (c) 2006-2008 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_DOM_UI_HISTORY_UI_H_
 #define CHROME_BROWSER_DOM_UI_HISTORY_UI_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 77 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(BrowsingHistoryHandler);
 };
 
 class HistoryUI : public DOMUI {
  public:
   explicit HistoryUI(TabContents* contents);
 
   // Return the URL for a given search term.
   static const GURL GetHistoryURLWithSearchText(const std::wstring& text);
 
-  static bool GetFaviconResourceBytes(std::vector<unsigned char>* bytes);
+  static RefCountedMemory* GetFaviconResourceBytes();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(HistoryUI);
 };
 
 #endif  // CHROME_BROWSER_DOM_UI_HISTORY_UI_H_