use SkColorType instead of (deprecated) SkBitmap::Config for copyTo

cc/layers/ui_resource_layer_impl_unittest.cc

Index: cc/layers/ui_resource_layer_impl_unittest.cc
diff --git a/cc/layers/ui_resource_layer_impl_unittest.cc b/cc/layers/ui_resource_layer_impl_unittest.cc
index 596cb3bc8a97c4ac3a0b21d6bf9d9e6f18795e7a..2fa489abbfad45976fb2928a298df041ac1e0281 100644
--- a/cc/layers/ui_resource_layer_impl_unittest.cc
+++ b/cc/layers/ui_resource_layer_impl_unittest.cc
@@ -34,15 +34,7 @@ scoped_ptr<UIResourceLayerImpl> GenerateUIResourceLayer(
   layer->CreateRenderSurface();
   layer->draw_properties().render_target = layer.get();
 
-  SkBitmap skbitmap;
-  skbitmap.setConfig(SkBitmap::kARGB_8888_Config,
-                     bitmap_size.width(),
-                     bitmap_size.height(),
-                     0,
-                     opaque ? kOpaque_SkAlphaType : kPremul_SkAlphaType);
-  skbitmap.allocPixels();
-  skbitmap.setImmutable();
-  UIResourceBitmap bitmap(skbitmap);
+  UIResourceBitmap bitmap(bitmap_size.width(), bitmap_size.height(), opaque);
 
   host_impl->CreateUIResource(uid, bitmap);
   layer->SetUIResourceId(uid);