PlzNavigate: stop navigations when opening a document for write

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 d1731be222111b2dea5bf60785f8dfa10e02e495..9932d1b67617d12d776830d56119b69b72256b44 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -589,6 +589,7 @@ class CONTENT_EXPORT RenderFrameImpl
   void didChangeThemeColor() override;
   void dispatchLoad() override;
   blink::WebEffectiveConnectionType getEffectiveConnectionType() override;
+  void abortClientNavigation() override;
   void didChangeSelection(bool is_empty_selection) override;
   bool handleCurrentKeyboardEvent() override;
   blink::WebColorChooser* createColorChooser(
@@ -897,6 +898,7 @@ class CONTENT_EXPORT RenderFrameImpl
                           const RequestNavigationParams& request_params,
                           bool has_stale_copy_in_cache,
                           int error_code);
+  void OnDroppedNavigation();
   void OnGetSavableResourceLinks();
   void OnGetSerializedHtmlWithLocalLinks(
       const std::map<GURL, base::FilePath>& url_to_local_path,