remove dst/rendertarget support for kARGB_4444_Config

src/core/SkBlitRow_D16.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBlitRow.h"
 #include "SkColorPriv.h"
 #include "SkDither.h"
@@ skipping 206 matching lines @@
     S32A_D565_Blend,
 
     // dither
     S32_D565_Opaque_Dither,
     S32_D565_Blend_Dither,
 
     S32A_D565_Opaque_Dither,
     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
     flags &= kFlags16_Mask;
 
     SkBlitRow::Proc proc = NULL;
 
     switch (config) {
         case SkBitmap::kRGB_565_Config:
             proc = PlatformProcs565(flags);
             if (NULL == proc) {
                 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;
     }
     return proc;
 }