Add the client for accessing Subresource Filter only list.

chrome/browser/safe_browsing/safe_browsing_service.h

Index: chrome/browser/safe_browsing/safe_browsing_service.h
diff --git a/chrome/browser/safe_browsing/safe_browsing_service.h b/chrome/browser/safe_browsing/safe_browsing_service.h
index d1d355499100f56654c773e772e1a2d32068da10..915d0026df27ad1ede480eb3db5a5e2950fac6b8 100644
--- a/chrome/browser/safe_browsing/safe_browsing_service.h
+++ b/chrome/browser/safe_browsing/safe_browsing_service.h
@@ -153,8 +153,8 @@ class SafeBrowsingService : public base::RefCountedThreadSafe<
   SafeBrowsingPingManager* ping_manager() const;
 
   // This may be NULL if v4 is not enabled by experiment.
-  const scoped_refptr<SafeBrowsingDatabaseManager>& v4_local_database_manager()
-      const;
+  virtual const scoped_refptr<SafeBrowsingDatabaseManager>&
+  v4_local_database_manager() const;
 
   // Returns a preference validation delegate that adds incidents to the
   // incident reporting service for validation failures. Returns NULL if the