Deal with frame removal by content scripts

extensions/renderer/dispatcher.cc

Index: extensions/renderer/dispatcher.cc
diff --git a/extensions/renderer/dispatcher.cc b/extensions/renderer/dispatcher.cc
index a8a2b3ed3076b3dc1d3405b6025a9c2025ce59cc..4b0145a35ee141ab9efbcb9503104b12a98e77c6 100644
--- a/extensions/renderer/dispatcher.cc
+++ b/extensions/renderer/dispatcher.cc
@@ -500,6 +500,26 @@ void Dispatcher::DidCreateDocumentElement(blink::WebLocalFrame* frame) {
   }
 }
 
+void Dispatcher::AfterDidCreateDocumentElement(
+    content::RenderFrame* render_frame) {
+  ExtensionFrameHelper* frame_helper = ExtensionFrameHelper::Get(render_frame);
+  if (!frame_helper)
+    return;  // The frame is invisible to extensions.
+
+  frame_helper->AfterDidCreateDocumentElement();
+  // |frame_helper| and |render_frame| might be dead by now.
+}
+
+void Dispatcher::AfterDidFinishDocumentLoad(
+    content::RenderFrame* render_frame) {
+  ExtensionFrameHelper* frame_helper = ExtensionFrameHelper::Get(render_frame);
+  if (!frame_helper)
+    return;  // The frame is invisible to extensions.
+
+  frame_helper->AfterDidFinishDocumentLoad();
+  // |frame_helper| and |render_frame| might be dead by now.
+}
+
 void Dispatcher::OnExtensionResponse(int request_id,
                                      bool success,
                                      const base::ListValue& response,