scope ComputeIsOpaque with SkBitmap

src/ports/SkImageDecoder_WIC.cpp

Index: src/ports/SkImageDecoder_WIC.cpp
diff --git a/src/ports/SkImageDecoder_WIC.cpp b/src/ports/SkImageDecoder_WIC.cpp
index 1bda67fe91d86861db18443fde8038622e7fb434..9aaed869e363592a97ed31ccf145d89a5c78d6d1 100644
--- a/src/ports/SkImageDecoder_WIC.cpp
+++ b/src/ports/SkImageDecoder_WIC.cpp
@@ -240,7 +240,7 @@ bool SkImageDecoder_WIC::decodeStream(SkStream* stream, SkBitmap* bm, WICModes w
         );
 
         // Note: we don't need to premultiply here since we specified PBGRA
-        if (ComputeIsOpaque(*bm)) {
+        if (SkBitmap::ComputeIsOpaque(*bm)) {
             bm->setAlphaType(kOpaque_SkAlphaType);
         }
     }