Remove PrerenderResourceThrottle and related infrastructure.

chrome/browser/prerender/prerender_tracker.h

Index: chrome/browser/prerender/prerender_tracker.h
diff --git a/chrome/browser/prerender/prerender_tracker.h b/chrome/browser/prerender/prerender_tracker.h
index 56d5dffc8fc176825c4448f902572f0d32c91023..a3d1af54b609184a075e071a671dc650d274d1da 100644
--- a/chrome/browser/prerender/prerender_tracker.h
+++ b/chrome/browser/prerender/prerender_tracker.h
@@ -10,7 +10,6 @@
 #include <set>
 #include <vector>
 
-#include "base/callback_forward.h"
 #include "base/gtest_prod_util.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/non_thread_safe.h"
@@ -22,33 +21,11 @@ namespace prerender {
 class PrerenderManager;
 struct RenderViewInfo;
 
-// An URLCounter keeps track of the number of occurrences of a prerendered URL.
-class URLCounter : public base::NonThreadSafe {
- public:
-  URLCounter();
-  ~URLCounter();
-
-  // Determines whether the URL is contained in the set.
-  bool MatchesURL(const GURL& url) const;
-
-  // Adds a URL to the set.
-  void AddURL(const GURL& url);
-
-  // Removes a number of URLs from the set.
-  void RemoveURLs(const std::vector<GURL>& urls);
-
- private:
-  typedef std::map<GURL, int> URLCountMap;
-  URLCountMap url_count_map_;
-};
-
 // PrerenderTracker is responsible for keeping track of all prerendering
 // RenderViews and their statuses.  Its list is guaranteed to be up to date
 // and can be modified on any thread.
 class PrerenderTracker {
  public:
-  typedef base::Callback<void(bool /* proceed */)> CheckURLCallback;
-
   PrerenderTracker();
   ~PrerenderTracker();
 
@@ -79,15 +56,6 @@ class PrerenderTracker {
   bool TryCancelOnIOThread(int child_id, int route_id,
                            FinalStatus final_status);
 
-  // Potentially delay a resource request on the IO thread to prevent a double
-  // get.  When this method returns true, the callback will be run later to
-  // indicate if the request should be allowed or canceled.
-  bool PotentiallyDelayRequestOnIOThread(
-      const GURL& gurl,
-      int child_id,
-      int route_id,
-      const CheckURLCallback& callback);
-
   void AddPrerenderURLOnUIThread(const GURL& url);
   void RemovePrerenderURLsOnUIThread(const std::vector<GURL>& urls);
 
@@ -168,10 +136,6 @@ class PrerenderTracker {
   // used to prevent locking when not needed.
   PossiblyPrerenderingChildRouteIdPairs possibly_prerendering_io_thread_set_;
 
-  // |url_counter_| keeps track of the top-level URLs which are being
-  // prerendered. It must only be accessed on the IO thread.
-  URLCounter url_counter_;
-
   DISALLOW_COPY_AND_ASSIGN(PrerenderTracker);
 };