Remove void** from disk_cache interface.

net/disk_cache/blockfile/backend_impl.h

Index: net/disk_cache/blockfile/backend_impl.h
diff --git a/net/disk_cache/blockfile/backend_impl.h b/net/disk_cache/blockfile/backend_impl.h
index c2d91a73feedd58e1ba0bc9a3138f8ba3d5733f0..8db2f74c3e1aa60136f14496c379759736aebf11 100644
--- a/net/disk_cache/blockfile/backend_impl.h
+++ b/net/disk_cache/blockfile/backend_impl.h
@@ -67,7 +67,7 @@ class NET_EXPORT_PRIVATE BackendImpl : public Backend {
   void CleanupCache();
 
   // Same behavior as OpenNextEntry but walks the list from back to front.
-  int OpenPrevEntry(void** iter, Entry** prev_entry,
+  int OpenPrevEntry(Iterator* iter, Entry** prev_entry,
                     const CompletionCallback& callback);
 
   // Synchronous implementation of the asynchronous interface.
@@ -279,9 +279,8 @@ class NET_EXPORT_PRIVATE BackendImpl : public Backend {
                                  const CompletionCallback& callback) OVERRIDE;
   virtual int DoomEntriesSince(base::Time initial_time,
                                const CompletionCallback& callback) OVERRIDE;
-  virtual int OpenNextEntry(void** iter, Entry** next_entry,
+  virtual int OpenNextEntry(Iterator* iter, Entry** next_entry,
                             const CompletionCallback& callback) OVERRIDE;
-  virtual void EndEnumeration(void** iter) OVERRIDE;
   virtual void GetStats(StatsItems* stats) OVERRIDE;
   virtual void OnExternalCacheHit(const std::string& key) OVERRIDE;