Revert of Initialize and reset V4LocalDBManager. Instantiate V4Stores.

components/safe_browsing_db/v4_update_protocol_manager.h

Index: components/safe_browsing_db/v4_update_protocol_manager.h
diff --git a/components/safe_browsing_db/v4_update_protocol_manager.h b/components/safe_browsing_db/v4_update_protocol_manager.h
index 92be60676f5990f9f83d7b5dfbaf7b5065d5425d..4b924a85fe5a80af2e685cdcb5852af1240768a5 100644
--- a/components/safe_browsing_db/v4_update_protocol_manager.h
+++ b/components/safe_browsing_db/v4_update_protocol_manager.h
@@ -68,9 +68,6 @@
   // net::URLFetcherDelegate interface.
   void OnURLFetchComplete(const net::URLFetcher* source) override;
 
-  // Schedule the next update without backoff.
-  void ScheduleNextUpdate();
-
  protected:
   // Constructs a V4UpdateProtocolManager that issues network requests using
   // |request_context_getter|.
@@ -127,8 +124,8 @@
   // Returns whether another update is currently scheduled.
   bool IsUpdateScheduled() const;
 
-  // Schedule the next update with backoff specified.
-  void ScheduleNextUpdateWithBackoff(bool back_off);
+  // Schedule the next update, considering whether we are in backoff.
+  void ScheduleNextUpdate(bool back_off);
 
   // Schedule the next update, after the given interval.
   void ScheduleNextUpdateAfterInterval(base::TimeDelta interval);
@@ -168,7 +165,7 @@
   int url_fetcher_id_;
 
   // The callback that's called when GetUpdates completes.
-  V4UpdateCallback update_callback_;
+  V4UpdateCallback callback_;
 
   // The pending update request. The request must be canceled when the object is
   // destroyed.
@@ -176,8 +173,6 @@
 
   // Timer to setup the next update request.
   base::OneShotTimer update_timer_;
-
-  base::Time last_response_time_;
 
   DISALLOW_COPY_AND_ASSIGN(V4UpdateProtocolManager);
 };