Remove void** from disk_cache interface.

net/disk_cache/memory/mem_backend_impl.h

Index: net/disk_cache/memory/mem_backend_impl.h
diff --git a/net/disk_cache/memory/mem_backend_impl.h b/net/disk_cache/memory/mem_backend_impl.h
index 5f31be54da9e4abb29087e91669316fa2b4f1241..05d202a679d8309af3f6ea3affd236c9b0376c0a 100644
--- a/net/disk_cache/memory/mem_backend_impl.h
+++ b/net/disk_cache/memory/mem_backend_impl.h
@@ -76,9 +76,8 @@ class NET_EXPORT_PRIVATE MemBackendImpl : 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(
       std::vector<std::pair<std::string, std::string> >* stats) OVERRIDE {}
   virtual void OnExternalCacheHit(const std::string& key) OVERRIDE;
@@ -94,7 +93,7 @@ class NET_EXPORT_PRIVATE MemBackendImpl : public Backend {
   bool DoomEntriesBetween(const base::Time initial_time,
                           const base::Time end_time);
   bool DoomEntriesSince(const base::Time initial_time);
-  bool OpenNextEntry(void** iter, Entry** next_entry);
+  bool OpenNextEntry(Iterator* iter, Entry** next_entry);
 
   // Deletes entries from the cache until the current size is below the limit.
   // If empty is true, the whole cache will be trimmed, regardless of being in