PlzNavigate: stop navigations when opening a document for write

content/browser/frame_host/navigator.h

Index: content/browser/frame_host/navigator.h
diff --git a/content/browser/frame_host/navigator.h b/content/browser/frame_host/navigator.h
index 5f0a059a79ce0a2c4f7b3e8337b040dc5f32baed..9426b2c2f0ce38e5fe8a882312edc57eb5f45c59 100644
--- a/content/browser/frame_host/navigator.h
+++ b/content/browser/frame_host/navigator.h
@@ -157,6 +157,10 @@ class CONTENT_EXPORT Navigator : public base::RefCounted<Navigator> {
                                  const BeginNavigationParams& begin_params);
 
   // PlzNavigate
+  // Used to abort an ongoing renderer-initiated navigation.
+  virtual void OnAbortNavigation(FrameTreeNode* frame_tree_node) {}
+
+  // PlzNavigate
   // Cancel a NavigationRequest for |frame_tree_node|. Called when
   // |frame_tree_node| is destroyed.
   virtual void CancelNavigation(FrameTreeNode* frame_tree_node) {}