Remove use of SkBitmap::Config (deprecated) from Source/web/tests/.

Source/web/tests/DragImageTest.cpp

 /*
  * Copyright (C) 2010 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 46 matching lines @@
     static PassRefPtr<TestImage> create(const IntSize& size)
     {
         return adoptRef(new TestImage(size));
     }
 
     explicit TestImage(const IntSize& size)
         : Image(0)
         , m_size(size)
     {
         m_nativeImage = NativeImageSkia::create();
-        m_nativeImage->bitmap().setConfig(SkBitmap::kARGB_8888_Config,
-                                          size.width(), size.height(), 0);
-        m_nativeImage->bitmap().allocPixels();
+        EXPECT_TRUE(m_nativeImage->bitmap().allocN32Pixels(size.width(), size.height()));
     }
 
     virtual IntSize size() const OVERRIDE
     {
         return m_size;
     }
 
     virtual PassRefPtr<NativeImageSkia> nativeImageForCurrentFrame() OVERRIDE
     {
         if (m_size.isZero())
@@ skipping 75 matching lines @@
 
     OwnPtr<DragImage> testImage =
         DragImage::create(url, testLabel, fontDescription, deviceScaleFactor);
     OwnPtr<DragImage> expectedImage =
         DragImage::create(url, expectedLabel, fontDescription, deviceScaleFactor);
 
     EXPECT_EQ(testImage->size().width(), expectedImage->size().width());
 }
 
 } // anonymous namespace