CrossSiteResourceHandler: cancel request if the RFH is gone

content/browser/loader/cross_site_resource_handler.h

Index: content/browser/loader/cross_site_resource_handler.h
diff --git a/content/browser/loader/cross_site_resource_handler.h b/content/browser/loader/cross_site_resource_handler.h
index b73a5a1475b799e0493ea87bd0311e2ff7638f55..db1dc84e5f77da2888914c3bc1c85e37e79c7623 100644
--- a/content/browser/loader/cross_site_resource_handler.h
+++ b/content/browser/loader/cross_site_resource_handler.h
@@ -26,6 +26,12 @@ struct TransitionLayerData;
 // and not a download.
 class CrossSiteResourceHandler : public LayeredResourceHandler {
  public:
+  enum class NavigationDecision {
+    TRANSFER_REQUIRED,
+    USE_EXISTING_RENDERER,
+    CANCEL_REQUEST
+  };
+
   CrossSiteResourceHandler(scoped_ptr<ResourceHandler> next_handler,
                            net::URLRequest* request);
   ~CrossSiteResourceHandler() override;
@@ -63,7 +69,7 @@ class CrossSiteResourceHandler : public LayeredResourceHandler {
   bool OnNormalResponseStarted(ResourceResponse* response,
                                bool* defer);
 
-  void ResumeOrTransfer(bool is_transfer);
+  void ResumeOrTransfer(NavigationDecision decision);
   void ResumeIfDeferred();
 
   // Called when about to defer a request.  Sets |did_defer_| and logs the