Remove the composite attribute on <img>

Source/core/frame/UseCounter.h

 /*
  * Copyright (C) 2012 Google, 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 462 matching lines @@
         MouseEventFromElement = 506,
         MouseEventToElement = 507,
         RequestFileSystem = 508,
         RequestFileSystemWorker = 509,
         RequestFileSystemSyncWorker = 510,
         UIEventLayerX = 511,
         UIEventLayerY = 512,
         UIEventPageX = 513,
         UIEventPageY = 514,
         BgPropertiesFixed = 515,
-        HTMLImageElementComposite = 516,
         DevToolsConsoleTimeline = 517,
         DevToolsConsoleProfile = 518,
         SVGStyleElementTitle = 519,
         PictureSourceSrc = 520,
         // The above items are available in M38 branch.
 
         Picture = 521,
         Sizes = 522,
         SrcsetXDescriptor = 523,
         SrcsetWDescriptor = 524,
@@ skipping 127 matching lines @@
 
     void updateMeasurements();
 
     OwnPtr<BitVector> m_countBits;
     BitVector m_CSSFeatureBits;
 };
 
 } // namespace blink
 
 #endif // UseCounter_h