use factory for colorshader, class is deprecated

Source/platform/graphics/BitmapPattern.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "platform/graphics/BitmapPattern.h"
 
 #include "platform/graphics/skia/SkiaUtils.h"
 #include "third_party/skia/include/core/SkCanvas.h"
-#include "third_party/skia/include/core/SkColorShader.h"
+#include "third_party/skia/include/core/SkShader.h"
 #include <v8.h>
 
 namespace blink {
 
 BitmapPattern::BitmapPattern(PassRefPtr<Image> image, RepeatMode repeatMode)
 : BitmapPatternBase(repeatMode, 0 )
 {
     if (image) {
         // If image is animated, what about the pattern?
         m_tileImage = image->nativeImageForCurrentFrame();
 
         if (m_tileImage)
             adjustExternalMemoryAllocated(m_tileImage->bitmap().getSafeSize());
     }
 }
 
 PassRefPtr<SkShader> BitmapPattern::createShader()
 {
     if (!m_tileImage) {
-        return adoptRef(new SkColorShader(SK_ColorTRANSPARENT));
+        return adoptRef(SkShader::CreateColorShader(SK_ColorTRANSPARENT));
     }
 
     SkMatrix localMatrix = affineTransformToSkMatrix(m_patternSpaceTransformation);
 
     if (isRepeatXY()) {
         return adoptRef(SkShader::CreateBitmapShader(m_tileImage->bitmap(), SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode, &localMatrix));
     }
 
     return BitmapPatternBase::createShader();
 }
 
 SkImageInfo BitmapPattern::getBitmapInfo()
 {
     return m_tileImage->bitmap().info();
 }
 
 void BitmapPattern::drawBitmapToCanvas(SkCanvas& canvas, SkPaint& paint)
 {
     canvas.drawBitmap(m_tileImage->bitmap(), SkIntToScalar(0), SkIntToScalar(0), &paint);
 }
 
 } // namespace