PlzNavigate: add cancel navigation logic for uncommitted requests

content/browser/loader/resource_dispatcher_host_impl.cc

Index: content/browser/loader/resource_dispatcher_host_impl.cc
diff --git a/content/browser/loader/resource_dispatcher_host_impl.cc b/content/browser/loader/resource_dispatcher_host_impl.cc
index 22ac6c03c70d48c7b0a3b11c7bbc54e8066c61ce..bfd1f0a80ac6be1ed45f2b18c4597408e9d12be8 100644
--- a/content/browser/loader/resource_dispatcher_host_impl.cc
+++ b/content/browser/loader/resource_dispatcher_host_impl.cc
@@ -1657,9 +1657,16 @@ void ResourceDispatcherHostImpl::FinishedWithResourcesForRequest(
   IncrementOutstandingRequestsCount(-1, *info);
 }
 
-void ResourceDispatcherHostImpl::NavigationRequest(
+void ResourceDispatcherHostImpl::StartNavigationRequest(
     const NavigationRequestInfo& info,
     scoped_refptr<ResourceRequestBody> request_body,
+    int64 navigation_request_id,
+    int64 frame_node_id) {
+  NOTIMPLEMENTED();
+}
+
+void ResourceDispatcherHostImpl::CancelNavigationRequest(
+    int64 navigation_request_id,
     int64 frame_node_id) {
   NOTIMPLEMENTED();
 }