remove dst/rendertarget support for kARGB_4444_Config

src/core/SkBlitRow_D16.cpp

Index: src/core/SkBlitRow_D16.cpp
diff --git a/src/core/SkBlitRow_D16.cpp b/src/core/SkBlitRow_D16.cpp
index 309e459c2e6abaef7882c4c4697079a9219c9478..e244723986a8af769cfa1469aa2d331f70348dd5 100644
--- a/src/core/SkBlitRow_D16.cpp
+++ b/src/core/SkBlitRow_D16.cpp
@@ -224,8 +224,6 @@ static const SkBlitRow::Proc gDefault_565_Procs[] = {
     S32A_D565_Blend_Dither
 };
 
-extern SkBlitRow::Proc SkBlitRow_Factory_4444(unsigned flags);
-
 SkBlitRow::Proc SkBlitRow::Factory(unsigned flags, SkBitmap::Config config) {
     SkASSERT(flags < SK_ARRAY_COUNT(gDefault_565_Procs));
     // just so we don't crash
@@ -240,12 +238,6 @@ SkBlitRow::Proc SkBlitRow::Factory(unsigned flags, SkBitmap::Config config) {
                 proc = gDefault_565_Procs[flags];
             }
             break;
-        case SkBitmap::kARGB_4444_Config:
-            proc = PlatformProcs4444(flags);
-            if (NULL == proc) {
-                proc = SkBlitRow_Factory_4444(flags);
-            }
-            break;
         default:
             break;
     }