SafeBrowsing: Move enabled_ to base class DB Manager

components/safe_browsing_db/database_manager.h

Index: components/safe_browsing_db/database_manager.h
diff --git a/components/safe_browsing_db/database_manager.h b/components/safe_browsing_db/database_manager.h
index 018bf15ba546c50f70aed9aead221bb112692f65..d3b43bf6ef01c3290c4ae864f16f240c0aa085e5 100644
--- a/components/safe_browsing_db/database_manager.h
+++ b/components/safe_browsing_db/database_manager.h
@@ -262,6 +262,10 @@ class SafeBrowsingDatabaseManager
   // responsible for deleting them when removing from the set.
   ApiCheckSet api_checks_;
 
+  // Whether the service is running. 'enabled_' is used by the
+  // SafeBrowsingDatabaseManager on the IO thread during normal operations.
+  bool enabled_;
+
   // Created and destroyed via StartOnIOThread/StopOnIOThread.
   std::unique_ptr<V4GetHashProtocolManager> v4_get_hash_protocol_manager_;