Replace ScriptStreamerTask with blink::Task and threadSafeBind()

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 4bbcdde37dc6c08ab18e6b3b7d801b4689695adc..ce476198cd8c049733a2b004919149a217f1d297 100644
--- a/Source/bindings/core/v8/ScriptStreamerThread.h
+++ b/Source/bindings/core/v8/ScriptStreamerThread.h
@@ -34,6 +34,8 @@ public:
 
     void taskDone();
 
+    static void runScriptStreamingTask(WTF::PassOwnPtr<v8::ScriptCompiler::ScriptStreamingTask>, ScriptStreamer*);
+
 private:
     ScriptStreamerThread()
         : m_runningTask(false) { }
@@ -52,18 +54,6 @@ private:
     mutable Mutex m_mutex; // Guards m_runningTask.
 };
 
-class ScriptStreamingTask : public WebThread::Task {
-    WTF_MAKE_NONCOPYABLE(ScriptStreamingTask);
-public:
-    ScriptStreamingTask(WTF::PassOwnPtr<v8::ScriptCompiler::ScriptStreamingTask>, ScriptStreamer*);
-    virtual void run() override;
-
-private:
-    WTF::OwnPtr<v8::ScriptCompiler::ScriptStreamingTask> m_v8Task;
-    ScriptStreamer* m_streamer;
-};
-
-
 } // namespace blink
 
 #endif // ScriptStreamerThread_h