deprecate asImageInfo

Source/platform/graphics/test/MockDiscardablePixelRef.h

Index: Source/platform/graphics/test/MockDiscardablePixelRef.h
diff --git a/Source/platform/graphics/test/MockDiscardablePixelRef.h b/Source/platform/graphics/test/MockDiscardablePixelRef.h
index ec1b71f0346a5ce3e3d2d837d6a7066421350216..0e8c6f2060a0621c0b478a644c730f8523170469 100644
--- a/Source/platform/graphics/test/MockDiscardablePixelRef.h
+++ b/Source/platform/graphics/test/MockDiscardablePixelRef.h
@@ -51,10 +51,9 @@ public:
     class Allocator : public SkBitmap::Allocator {
     public:
         virtual bool allocPixelRef(SkBitmap* dst, SkColorTable* ct) SK_OVERRIDE {
-            SkImageInfo info;
-            if (!dst->asImageInfo(&info)) {
+            const SkImageInfo& info = dst->info();
+            if (kUnknown_SkColorType == info.colorType())
                 return false;
-            }
             SkAutoTUnref<SkPixelRef> pr(new MockDiscardablePixelRef(info, dst->rowBytes()));
             dst->setPixelRef(pr);
             return true;