Remove unused GC::writePixels() wrapper.

Source/platform/graphics/GraphicsContext.h

Index: Source/platform/graphics/GraphicsContext.h
diff --git a/Source/platform/graphics/GraphicsContext.h b/Source/platform/graphics/GraphicsContext.h
index 5a96151e810e64e0b384356b31244ff6a12e6293..2d8bedcdbee05700ada87e7167a3ebf94a440b76 100644
--- a/Source/platform/graphics/GraphicsContext.h
+++ b/Source/platform/graphics/GraphicsContext.h
@@ -285,7 +285,6 @@ public:
     // These methods write to the canvas and modify the opaque region, if tracked.
     // Also drawLine(const IntPoint& point1, const IntPoint& point2) and fillRoundedRect
     void writePixels(const SkImageInfo&, const void* pixels, size_t rowBytes, int x, int y);
-    void writePixels(const SkBitmap&, int x, int y);
     void drawBitmap(const SkBitmap&, SkScalar, SkScalar, const SkPaint* = 0);
     void drawBitmapRect(const SkBitmap&, const SkRect*, const SkRect&, const SkPaint* = 0);
     void drawOval(const SkRect&, const SkPaint&);