Refactor safebrowsing StartDisplayingBlockingPage

components/safe_browsing/base_resource_throttle.h

Index: components/safe_browsing/base_resource_throttle.h
diff --git a/components/safe_browsing/base_resource_throttle.h b/components/safe_browsing/base_resource_throttle.h
index a14fb17dc76fc5504cfdfa49fab7c2a13d27ced4..adb4d3d0da510d9e632c82168b10a3c3ae74a8fc 100644
--- a/components/safe_browsing/base_resource_throttle.h
+++ b/components/safe_browsing/base_resource_throttle.h
@@ -86,6 +86,12 @@ class BaseResourceThrottle
 
   ~BaseResourceThrottle() override;
 
+  // If our blocked resource is the main frame, this calls
+  // ContentSubresourceFilterDriverFactory's
+  // OnMainResourceMatchedSafeBrowsingBlacklist method.
+  static void NotifySubresourceFilterOfBlockedResource(
+      const security_interstitials::UnsafeResource& resource);
+
   // Does nothing in the base class. Override this to destroy prerender contents
   // in chrome.
   virtual void MaybeDestroyPrerenderContents(