PlzNavigate: don't stop all loaders when renderer-initiated nav fails

content/renderer/render_frame_impl.h

Index: content/renderer/render_frame_impl.h
diff --git a/content/renderer/render_frame_impl.h b/content/renderer/render_frame_impl.h
index 5bc63af1ac4b2f99f7f8cd1413ff2ec817fa64d6..003532a7d15d722667a8a003e1fc520f715ab3cc 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -905,6 +905,7 @@ class CONTENT_EXPORT RenderFrameImpl
                           int error_code);
   void OnReportContentSecurityPolicyViolation(
       const content::CSPViolationParams& violation_params);
+  void OnDroppedNavigation(int navigation_id);
   void OnGetSavableResourceLinks();
   void OnGetSerializedHtmlWithLocalLinks(
       const std::map<GURL, base::FilePath>& url_to_local_path,
@@ -1424,6 +1425,10 @@ class CONTENT_EXPORT RenderFrameImpl
   // is used and released in didStartProvisionalLoad().
   std::unique_ptr<PendingNavigationInfo> pending_navigation_info_;
 
+  // PlzNavigate
+  // An id to identify the last navigation sent to the browser.
+  int navigation_id_ = 0;
+
   base::WeakPtrFactory<RenderFrameImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameImpl);