Fix Runtime.executionContextCreated for crafted iframes.

Source/bindings/core/v8/ScriptController.cpp

Index: Source/bindings/core/v8/ScriptController.cpp
diff --git a/Source/bindings/core/v8/ScriptController.cpp b/Source/bindings/core/v8/ScriptController.cpp
index 98eb5c2a9e0d02780786aa2c0a1ccef320b7998f..069b0383145e562559f505501552072448b20078 100644
--- a/Source/bindings/core/v8/ScriptController.cpp
+++ b/Source/bindings/core/v8/ScriptController.cpp
@@ -218,6 +218,11 @@ bool ScriptController::initializeMainWorld()
     return windowProxy(DOMWrapperWorld::mainWorld())->isContextInitialized();
 }
 
+bool ScriptController::isMainWorldInitialized()
+{
+    return m_windowProxy->isContextInitialized();
+}
+
 WindowProxy* ScriptController::existingWindowProxy(DOMWrapperWorld& world)
 {
     if (world.isMainWorld())