Removing prerender dead code.

chrome/browser/prerender/prerender_tab_helper.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.
 
 #ifndef CHROME_BROWSER_PRERENDER_PRERENDER_TAB_HELPER_H_
 #define CHROME_BROWSER_PRERENDER_PRERENDER_TAB_HELPER_H_
 
 #include "base/time.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/public/browser/web_contents_observer.h"
@@ skipping 42 matching lines @@
 
   // Retrieves the PrerenderManager, or NULL, if none was found.
   PrerenderManager* MaybeGetPrerenderManager() const;
 
   // Returns whether the WebContents being observed is currently prerendering.
   bool IsPrerendering();
 
   // Returns whether the WebContents being observed was prerendered.
   bool IsPrerendered();
 
-  // TabContents we're created for.
-  TabContents* tab_;
-
   // System time at which the current load was started for the purpose of
   // the perceived page load time (PPLT).
   base::TimeTicks pplt_load_start_;
 
   // System time at which the actual pageload started (pre-swapin), if
   // a applicable (in cases when a prerender that was still loading was
   // swapped in).
   base::TimeTicks actual_load_start_;
 
   // Current URL being loaded.
   GURL url_;
 
   DISALLOW_COPY_AND_ASSIGN(PrerenderTabHelper);
 };
 
 }  // namespace prerender
 
 #endif  // CHROME_BROWSER_PRERENDER_PRERENDER_TAB_HELPER_H_