Deal with frame removal by content scripts

third_party/WebKit/public/web/WebFrameClient.h

Index: third_party/WebKit/public/web/WebFrameClient.h
diff --git a/third_party/WebKit/public/web/WebFrameClient.h b/third_party/WebKit/public/web/WebFrameClient.h
index e0578dc5fb4b828bc759731c50267e2ef041a896..eef98c4e544d954552452e847f44d1aae17a3863 100644
--- a/third_party/WebKit/public/web/WebFrameClient.h
+++ b/third_party/WebKit/public/web/WebFrameClient.h
@@ -297,8 +297,13 @@ public:
     virtual void didClearWindowObject(WebLocalFrame* frame) { }
 
     // The document element has been created.
+    // This method may not invalidate the frame, nor execute JavaScript code.
     virtual void didCreateDocumentElement(WebLocalFrame*) { }
 
+    // Like |didCreateDocumentElement|, except this method may run JavaScript
+    // code (and possibly invalidate the frame).
+    virtual void runScriptsAtDocumentElementAvailable(WebLocalFrame*) { }
+
     // The page title is available.
     virtual void didReceiveTitle(WebLocalFrame* frame, const WebString& title, WebTextDirection direction) { }
 
@@ -306,8 +311,13 @@ public:
     virtual void didChangeIcon(WebLocalFrame*, WebIconURL::Type) { }
 
     // The frame's document finished loading.
+    // This method may not execute JavaScript code.
     virtual void didFinishDocumentLoad(WebLocalFrame*, bool documentIsEmpty) { }
 
+    // Like |didFinishDocumentLoad|, except this method may run JavaScript
+    // code (and possibly invalidate the frame).
+    virtual void runScriptsAtDocumentReady(WebLocalFrame*) { }
+
     // The 'load' event was dispatched.
     virtual void didHandleOnloadEvents(WebLocalFrame*) { }