Remove uses of SkBitmap::Config (deprecated) from core/ and platform/.

Source/platform/graphics/UnacceleratedImageBufferSurface.cpp

Index: Source/platform/graphics/UnacceleratedImageBufferSurface.cpp
diff --git a/Source/platform/graphics/UnacceleratedImageBufferSurface.cpp b/Source/platform/graphics/UnacceleratedImageBufferSurface.cpp
index 40812df5e776038dbafc423a578370ea08678312..50b12726a236eaf85c8a3787e5d180f9aa048bae 100644
--- a/Source/platform/graphics/UnacceleratedImageBufferSurface.cpp
+++ b/Source/platform/graphics/UnacceleratedImageBufferSurface.cpp
@@ -32,20 +32,16 @@
 #include "platform/graphics/UnacceleratedImageBufferSurface.h"
 
 #include "third_party/skia/include/core/SkCanvas.h"
-#include "wtf/PassOwnPtr.h"
+#include "wtf/PassRefPtr.h"
 
 namespace WebCore {
 
 UnacceleratedImageBufferSurface::UnacceleratedImageBufferSurface(const IntSize& size, OpacityMode opacityMode)
     : ImageBufferSurface(size, opacityMode)
+    , m_canvas(adoptRef(SkCanvas::NewRasterN32(size.width(), size.height())))
 {
-    SkBitmap bitmap;
-    bitmap.setConfig(SkBitmap::kARGB_8888_Config, size.width(), size.height());
-    bitmap.allocPixels();
-    if (bitmap.isNull())
-        return;
-    m_canvas = adoptPtr(new SkCanvas(bitmap));
-    clear();
+    if (m_canvas)
+        clear();
 }
 
 } // namespace WebCore