Add a WebLockOrientationError independant from WebLockOrientationCallback.

Source/modules/screen_orientation/LockOrientationCallback.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 LockOrientationCallback_h
 #define LockOrientationCallback_h
 
 #include "public/platform/WebLockOrientationCallback.h"
 #include "public/platform/WebScreenOrientationType.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefPtr.h"
 
 namespace WebCore {
 
 class ScriptPromiseResolverWithContext;
 
 // LockOrientationCallback is an implementation of WebLockOrientationCallback
 // that will resolve the underlying promise depending on the result passed to
 // the callback.
 class LockOrientationCallback FINAL : public blink::WebLockOrientationCallback {
     WTF_MAKE_NONCOPYABLE(LockOrientationCallback);
 public:
     explicit LockOrientationCallback(PassRefPtr<ScriptPromiseResolverWithContext>);
     virtual ~LockOrientationCallback();
 
     virtual void onSuccess(unsigned angle, blink::WebScreenOrientationType) OVERRIDE;
     virtual void onError(ErrorType) OVERRIDE;
+    virtual void onError(blink::WebLockOrientationError) OVERRIDE;
 
 private:
     RefPtr<ScriptPromiseResolverWithContext> m_resolver;
 };
 
 } // namespace WebCore
 
 #endif // LockOrientationCallback_h
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