PlzNavigate: add cancel navigation logic for uncommitted requests

content/browser/loader/resource_dispatcher_host_impl.h

Index: content/browser/loader/resource_dispatcher_host_impl.h
diff --git a/content/browser/loader/resource_dispatcher_host_impl.h b/content/browser/loader/resource_dispatcher_host_impl.h
index 269af9215f943228470130f189116c1b93a1381d..943e69d220e0fbe2eaeca9b246c64d2ad95c4741 100644
--- a/content/browser/loader/resource_dispatcher_host_impl.h
+++ b/content/browser/loader/resource_dispatcher_host_impl.h
@@ -244,6 +244,13 @@ class CONTENT_EXPORT ResourceDispatcherHostImpl
                          scoped_refptr<ResourceRequestBody> request_body,
                          int64 frame_node_id);
 
+  // PlzNavigate
+  // Called by NavigationRequest to cancel a navigation request with the
+  // provided |navigation_request_id| from the node identified by
+  // |frame_node_id|.
+  void CancelNavigationRequest(int64 navigation_request_id,
+                               int64 frame_node_id);
+
  private:
   friend class ResourceDispatcherHostTest;