    virtual v8::Local<v8::Context> mainWorldScriptContext() const = 0;
  
 +  virtual v8::Local<v8::Context> worldScriptContext(
-+      v8::Isolate* isolate, int worldID, int extensionGroup) const = 0;
++      v8::Isolate* isolate, int worldID) const = 0;
 +
    // Returns true if the WebFrame currently executing JavaScript has access
    // to the given WebFrame, or false otherwise.

 }
 
+v8::Local<v8::Context> WebRemoteFrameImpl::worldScriptContext(
+    v8::Isolate* isolate, int worldID, int extensionGroup) const {
+  NOTREACHED();
+  return v8::Local<v8::Context>();
+}

     const {
   return toV8Context(frame(), DOMWrapperWorld::mainWorld());
diff --git a/third_party/WebKit/Source/web/WebRemoteFrameImpl.h b/third_party/WebKit/Source/web/WebRemoteFrameImpl.h
index d049228..de5d606 100644
--- a/third_party/WebKit/Source/web/WebRemoteFrameImpl.h
+++ b/third_party/WebKit/Source/web/WebRemoteFrameImpl.h
@@ -75,6 +75,8 @@ class WEB_EXPORT WebRemoteFrameImpl final
