Reland r113261 rebased after revert of r113249.

net/disk_cache/mem_backend_impl.h

Index: net/disk_cache/mem_backend_impl.h
diff --git a/net/disk_cache/mem_backend_impl.h b/net/disk_cache/mem_backend_impl.h
index abf14439db7b968251487920a04c671f51e7483e..326bfba6a33438ed22590f1c19dbf658fcb23748 100644
--- a/net/disk_cache/mem_backend_impl.h
+++ b/net/disk_cache/mem_backend_impl.h
@@ -71,9 +71,14 @@ class NET_EXPORT_PRIVATE MemBackendImpl : public Backend {
   virtual int DoomEntry(const std::string& key,
                         OldCompletionCallback* callback) OVERRIDE;
   virtual int DoomAllEntries(OldCompletionCallback* callback) OVERRIDE;
+  virtual int DoomAllEntries(const net::CompletionCallback& callback) OVERRIDE;
   virtual int DoomEntriesBetween(const base::Time initial_time,
                                  const base::Time end_time,
                                  OldCompletionCallback* callback) OVERRIDE;
+  virtual int DoomEntriesBetween(
+      const base::Time initial_time,
+      const base::Time end_time,
+      const net::CompletionCallback& callback) OVERRIDE;
   virtual int DoomEntriesSince(const base::Time initial_time,
                                OldCompletionCallback* callback) OVERRIDE;
   virtual int OpenNextEntry(void** iter, Entry** next_entry,