Remove external BitmapImage lazy decoding tracking

Source/platform/graphics/FrameData.cpp

 /*
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2008 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
@@ skipping 17 matching lines @@
 #include "platform/graphics/FrameData.h"
 
 namespace blink {
 
 FrameData::FrameData()
     : m_orientation(DefaultImageOrientation)
     , m_duration(0)
     , m_haveMetadata(false)
     , m_isComplete(false)
     , m_hasAlpha(true)
-    , m_isLazyDecoded(false)
     , m_frameBytes(0)
 {
 }
 
 FrameData::~FrameData()
 {
     clear(true);
 }
 
 bool FrameData::clear(bool clearMetadata)
 {
     if (clearMetadata)
         m_haveMetadata = false;
 
     m_orientation = DefaultImageOrientation;
-    m_isLazyDecoded = false;
     m_frameBytes = 0;
 
     if (m_frame) {
         m_frame.clear();
         return true;
     }
     return false;
 }
 
 } // namespace blink