stop using SkBitmap::Config

R=scroggo@google.com

Author: reed@chromium.org

Review URL: https://codereview.chromium.org/338493005
diff --git a/tests/KtxTest.cpp b/tests/KtxTest.cpp
index 94a4c22..93edaf4 100644
--- a/tests/KtxTest.cpp
+++ b/tests/KtxTest.cpp
@@ -115,7 +115,7 @@
     bool imageDecodeSuccess = SkImageDecoder::DecodeStream(stream, &decodedBitmap);
     REPORTER_ASSERT(reporter, imageDecodeSuccess);
 
-    REPORTER_ASSERT(reporter, decodedBitmap.config() == SkBitmap::kARGB_8888_Config);
+    REPORTER_ASSERT(reporter, decodedBitmap.colorType() == kN32_SkColorType);
     REPORTER_ASSERT(reporter, decodedBitmap.alphaType() == kPremul_SkAlphaType);
     REPORTER_ASSERT(reporter, decodedBitmap.width() == 2);
     REPORTER_ASSERT(reporter, decodedBitmap.height() == 2);