Remove GraphicsContext::fastMod and ::isDrawingToLayer.

Source/platform/graphics/GraphicsContext.cpp

 /*
  * Copyright (C) 2003, 2004, 2005, 2006, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2013 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
@@ skipping 363 matching lines @@
 
     paint->setLCDRenderText(couldUseLCDRenderedText());
 }
 
 bool GraphicsContext::couldUseLCDRenderedText()
 {
     // Our layers only have a single alpha channel. This means that subpixel
     // rendered text cannot be composited correctly when the layer is
     // collapsed. Therefore, subpixel text is contextDisabled when we are drawing
     // onto a layer.
-    if (contextDisabled() || isDrawingToLayer() || !isCertainlyOpaque())
+    if (contextDisabled() || m_canvas->isDrawingToLayer() || !isCertainlyOpaque())
         return false;
 
     return shouldSmoothFonts();
 }
 
 void GraphicsContext::setCompositeOperation(CompositeOperator compositeOperation, WebBlendMode blendMode)
 {
     if (contextDisabled())
         return;
     mutableState()->setCompositeOperation(compositeOperation, blendMode);
@@ skipping 1422 matching lines @@
 
 void GraphicsContext::didDrawTextInRect(const SkRect& textRect)
 {
     if (m_trackTextRegion) {
         TRACE_EVENT0("skia", "GraphicsContext::didDrawTextInRect");
         m_textRegion.join(textRect);
     }
 }
 
 }