Remove PosterWaitingForVideo which is redundant

Source/core/html/HTMLVideoElement.h

 /*
  * Copyright (C) 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 54 matching lines @@
     unsigned webkitDecodedFrameCount() const;
     unsigned webkitDroppedFrameCount() const;
 
     // Used by canvas to gain raw pixel access
     void paintCurrentFrameInContext(GraphicsContext*, const IntRect&) const;
 
     // Used by WebGL to do GPU-GPU textures copy if possible.
     // See more details at MediaPlayer::copyVideoTextureToPlatformTexture() defined in Source/WebCore/platform/graphics/MediaPlayer.h.
     bool copyVideoTextureToPlatformTexture(WebGraphicsContext3D*, Platform3DObject texture, GC3Dint level, GLenum internalFormat, GLenum type, bool premultiplyAlpha, bool flipY);
 
-    bool shouldDisplayPosterImage() const { return displayMode() == Poster || displayMode() == PosterWaitingForVideo; }
+    bool shouldDisplayPosterImage() const { return displayMode() == Poster; }
 
     KURL posterImageURL() const;
 
     // FIXME: Remove this when WebMediaPlayerClientImpl::loadInternal does not depend on it.
     virtual KURL mediaPlayerPosterURL() override;
 
     // CanvasImageSource implementation
     virtual PassRefPtr<Image> getSourceImageForCanvas(SourceImageMode, SourceImageStatus*) const override;
     virtual bool isVideoElement() const override { return true; }
     virtual bool wouldTaintOrigin(SecurityOrigin*) const override;
@@ skipping 22 matching lines @@
     virtual void setDisplayMode(DisplayMode) override;
 
     OwnPtrWillBeMember<HTMLImageLoader> m_imageLoader;
 
     AtomicString m_defaultPosterURL;
 };
 
 } // namespace blink
 
 #endif // HTMLVideoElement_h