Fix r157217, committed patch set didn't contain the latest review modifications.

Source/core/inspector/InspectorOverlay.cpp

Index: Source/core/inspector/InspectorOverlay.cpp
diff --git a/Source/core/inspector/InspectorOverlay.cpp b/Source/core/inspector/InspectorOverlay.cpp
index e9705662cb2eecc19aba045ad02442c09f1b138f..a33fb4cd62d3cc88b1a8c22cdd0917fd6f297a07 100644
--- a/Source/core/inspector/InspectorOverlay.cpp
+++ b/Source/core/inspector/InspectorOverlay.cpp
@@ -633,7 +633,7 @@ Page* InspectorOverlay::overlayPage()
     DocumentWriter* writer = loader->activeDocumentLoader()->beginWriting("text/html", "UTF-8");
     writer->addData(reinterpret_cast<const char*>(InspectorOverlayPage_html), sizeof(InspectorOverlayPage_html));
     loader->activeDocumentLoader()->endWriting(writer);
-    v8::Isolate* isolate = frame->script()->isolate();
+    v8::Isolate* isolate = isolateForFrame(frame.get());
     v8::HandleScope handleScope(isolate);
     v8::Handle<v8::Context> frameContext = frame->script()->currentWorldContext();
     v8::Context::Scope contextScope(frameContext);