Don't allow main world initialization while creating the initial empty document

third_party/WebKit/Source/bindings/core/v8/ScriptController.cpp

Index: third_party/WebKit/Source/bindings/core/v8/ScriptController.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/ScriptController.cpp b/third_party/WebKit/Source/bindings/core/v8/ScriptController.cpp
index 4a354bc7fb70624629aa131c0352746359a4041c..bfba263c2257f9f3edbd7a07e4f22c6dc7e4db04 100644
--- a/third_party/WebKit/Source/bindings/core/v8/ScriptController.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/ScriptController.cpp
@@ -198,7 +198,7 @@ v8::Local<v8::Value> ScriptController::executeScriptAndReturnValue(v8::Local<v8:
 
 bool ScriptController::initializeMainWorld()
 {
-    if (m_windowProxyManager->mainWorldProxy()->isContextInitialized())
+    if (m_windowProxyManager->mainWorldProxy()->isContextInitialized() || frame()->loader().stateMachine()->creatingInitialEmptyDocument())
         return false;
     return windowProxy(DOMWrapperWorld::mainWorld())->isContextInitialized();
 }