remove dst/rendertarget support for kARGB_4444_Config

tests/BitmapHasherTest.cpp

Index: tests/BitmapHasherTest.cpp
diff --git a/tests/BitmapHasherTest.cpp b/tests/BitmapHasherTest.cpp
index 04de7074f7fbfa715c687a3502c975d42d1ed68b..924cea2dcc0532e81c6848de38f80413825f2916 100644
--- a/tests/BitmapHasherTest.cpp
+++ b/tests/BitmapHasherTest.cpp
@@ -51,10 +51,6 @@ namespace skiatest {
             CreateTestBitmap(bitmap, SkBitmap::kARGB_8888_Config, 555, 333, SK_ColorGREEN);
             REPORTER_ASSERT(fReporter, SkBitmapHasher::ComputeDigest(bitmap, &digest));
             REPORTER_ASSERT(fReporter, digest == 0x2423c51cad6d1edcULL);
-            // same pixel colors in a different config should yield the same checksum
-            CreateTestBitmap(bitmap, SkBitmap::kARGB_4444_Config, 555, 333, SK_ColorGREEN);
-            REPORTER_ASSERT(fReporter, SkBitmapHasher::ComputeDigest(bitmap, &digest));
-            REPORTER_ASSERT(fReporter, digest == 0x2423c51cad6d1edcULL);
         }
 
         Reporter* fReporter;