promote SkImage::AlphaType to SkAlphaType

BUG=
R=bsalomon@google.com

Review URL: https://codereview.chromium.org/24130009

git-svn-id: http://skia.googlecode.com/svn/trunk@11421 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/bench/DeferredSurfaceCopyBench.cpp b/bench/DeferredSurfaceCopyBench.cpp
index 2aaebe7..f9f8c8e 100644
--- a/bench/DeferredSurfaceCopyBench.cpp
+++ b/bench/DeferredSurfaceCopyBench.cpp
@@ -38,7 +38,7 @@
         info.fWidth = kSurfaceWidth;
         info.fHeight = kSurfaceHeight;
         info.fColorType = SkImage::kPMColor_ColorType;
-        info.fAlphaType = SkImage::kPremul_AlphaType;
+        info.fAlphaType = kPremul_SkAlphaType;
         const SkRect fullCanvasRect = SkRect::MakeWH(
             SkIntToScalar(kSurfaceWidth), SkIntToScalar(kSurfaceHeight));
         SkSurface* surface;