Make ReadableStream implementation up to date.

Source/core/streams/ReadableStream.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 ReadableStream_h
 #define ReadableStream_h
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptPromiseProperty.h"
 #include "bindings/core/v8/ScriptState.h"
@@ skipping 54 matching lines @@
     void readPreliminaryCheck(ExceptionState&);
     void readPostAction();
 
 private:
     typedef ScriptPromiseProperty<Member<ReadableStream>, V8UndefinedType, RefPtrWillBeMember<DOMException> > WaitPromise;
     typedef ScriptPromiseProperty<Member<ReadableStream>, V8UndefinedType, RefPtrWillBeMember<DOMException> > ClosedPromise;
 
     virtual bool isQueueEmpty() const = 0;
     virtual void clearQueue() = 0;
 
-    void callOrSchedulePull();
+    void callPullIfNeeded();
 
     Member<UnderlyingSource> m_source;
     bool m_isStarted;
     bool m_isDraining;
     bool m_isPulling;
-    bool m_isSchedulingPull;
     State m_state;
 
     Member<WaitPromise> m_wait;
     Member<ClosedPromise> m_closed;
     RefPtrWillBeMember<DOMException> m_exception;
 };
 
 } // namespace blink
 
 #endif // ReadableStream_h