Replace ScriptStreamerTask with blink::Task and threadSafeBind()

Source/bindings/core/v8/ScriptStreamerThread.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ScriptStreamerThread_h
 #define ScriptStreamerThread_h
 
 #include "core/CoreExport.h"
 #include "platform/TaskSynchronizer.h"
 #include "public/platform/WebThread.h"
@@ skipping 16 matching lines @@
     void postTask(WebThread::Task*);
 
     bool isRunningTask() const
     {
         MutexLocker locker(m_mutex);
         return m_runningTask;
     }
 
     void taskDone();
 
+    static void runScriptStreamingTask(WTF::PassOwnPtr<v8::ScriptCompiler::ScriptStreamingTask>, ScriptStreamer*);
+
 private:
     ScriptStreamerThread()
         : m_runningTask(false) { }
 
     bool isRunning() const
     {
         return !!m_thread;
     }
 
     WebThread& platformThread();
 
     // At the moment, we only use one thread, so we can only stream one script
     // at a time. FIXME: Use a thread pool and stream multiple scripts.
     WTF::OwnPtr<WebThread> m_thread;
     bool m_runningTask;
     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