Script streaming: Add an option to make the main thread block (wait for parsing)

Source/bindings/core/v8/ScriptStreamerThread.h

Index: Source/bindings/core/v8/ScriptStreamerThread.h
diff --git a/Source/bindings/core/v8/ScriptStreamerThread.h b/Source/bindings/core/v8/ScriptStreamerThread.h
index c7328ddea5c53b9569927990c47682fd0beb1ac5..d861582dde3bb07b445accda07db43669b66ddc2 100644
--- a/Source/bindings/core/v8/ScriptStreamerThread.h
+++ b/Source/bindings/core/v8/ScriptStreamerThread.h
@@ -42,11 +42,6 @@ private:
         return !!m_thread;
     }
 
-    void markAsCompleted(TaskSynchronizer* taskSynchronizer)
-    {
-        taskSynchronizer->taskCompleted();
-    }
-
     blink::WebThread& platformThread();
 
     // At the moment, we only use one thread, so we can only stream one script