Removing unused hasValidImageBuffer and activeSelectionStartListIndex

Source/core/html/HTMLCanvasElement.cpp

 /*
  * Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. 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.
@@ skipping 767 matching lines @@
 }
 
 void HTMLCanvasElement::discardImageBuffer()
 {
     m_contextStateSaver.clear(); // uses context owned by m_imageBuffer
     m_imageBuffer.clear();
     m_dirtyRect = FloatRect();
     updateExternallyAllocatedMemory();
 }
 
-bool HTMLCanvasElement::hasValidImageBuffer() const
-{
-    return m_imageBuffer && m_imageBuffer->isSurfaceValid();
-}
-
 void HTMLCanvasElement::clearCopiedImage()
 {
     if (m_copiedImage) {
         m_copiedImage.clear();
         updateExternallyAllocatedMemory();
     }
 }
 
 AffineTransform HTMLCanvasElement::baseTransform() const
 {
@@ skipping 62 matching lines @@
 {
     return !originClean();
 }
 
 FloatSize HTMLCanvasElement::sourceSize() const
 {
     return FloatSize(width(), height());
 }
 
 }