Make PrerenderTracker's resource_throttle_io_thread_map_ use RenderFrame IDs instead of RenderView …

chrome/browser/prerender/prerender_tracker.h

Index: chrome/browser/prerender/prerender_tracker.h
===================================================================
--- chrome/browser/prerender/prerender_tracker.h	(revision 245386)
+++ chrome/browser/prerender/prerender_tracker.h	(working copy)
@@ -35,11 +35,6 @@
   PrerenderTracker();
   virtual ~PrerenderTracker();
 
-  // Returns whether or not a RenderView is prerendering.  Can only be called on
-  // the IO thread.  Does not acquire a lock, so may claim a RenderView that has
-  // been displayed or destroyed is still prerendering.
-  bool IsPrerenderingOnIOThread(int child_id, int route_id) const;
-
   // Returns whether or not a RenderFrame and URL are regarding a pending
   // prerender swap. Can only be called on the IO thread. Does not acquire a
   // lock.
@@ -73,6 +68,7 @@
 
  private:
   friend class PrerenderContents;
+  friend class PrerenderTrackerTest;
 
   // Map of child/route id pairs to final statuses.
   typedef std::map<ChildRouteIdPair, RenderViewInfo> FinalStatusMap;