deprecate asImageInfo

Source/platform/graphics/DiscardablePixelRef.cpp

Index: Source/platform/graphics/DiscardablePixelRef.cpp
diff --git a/Source/platform/graphics/DiscardablePixelRef.cpp b/Source/platform/graphics/DiscardablePixelRef.cpp
index 3c1ad5c4d7a331884dcabeb7038df6ab3e4097b7..2029a32897a73ea1294f043c3c2d2e79d090ed7a 100644
--- a/Source/platform/graphics/DiscardablePixelRef.cpp
+++ b/Source/platform/graphics/DiscardablePixelRef.cpp
@@ -48,8 +48,8 @@ bool DiscardablePixelRefAllocator::allocPixelRef(SkBitmap* dst, SkColorTable* ct
     if (size < 0 || !sk_64_isS32(size))
         return false;
 
-    SkImageInfo info;
-    if (!dst->asImageInfo(&info))
+    const SkImageInfo& info = dst->info();
+    if (kUnknown_SkColorType == info.colorType())
         return false;
 
     SkAutoTUnref<DiscardablePixelRef> pixelRef(new DiscardablePixelRef(info, dst->rowBytes(), adoptPtr(new SkMutex())));