remove dst/rendertarget support for kARGB_4444_Config

src/core/SkCoreBlitters.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkCoreBlitters_DEFINED
 #define SkCoreBlitters_DEFINED
 
@@ skipping 136 matching lines @@
     SkARGB32_Shader_Blitter& operator=(const SkARGB32_Shader_Blitter&);
 
     typedef SkShaderBlitter INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 class SkA1_Blitter : public SkRasterBlitter {
 public:
     SkA1_Blitter(const SkBitmap& device, const SkPaint& paint);
-    virtual void blitH(int x, int y, int width);
+    virtual void blitH(int x, int y, int width) SK_OVERRIDE;
 
 private:
     uint8_t fSrcA;
 
     // illegal
     SkA1_Blitter& operator=(const SkA1_Blitter&);
 
     typedef SkRasterBlitter INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 /*  These return the correct subclass of blitter for their device config.
 
     Currently, they make the following assumptions about the state of the
     paint:
 
     1. If there is an xfermode, there will also be a shader
     2. If there is a colorfilter, there will be a shader that itself handles
        calling the filter, so the blitter can always ignore the colorfilter obj
 
     These pre-conditions must be handled by the caller, in our case
     SkBlitter::Choose(...)
  */
 
-extern SkBlitter* SkBlitter_ChooseD4444(const SkBitmap& device,
-                                        const SkPaint& paint,
-                                        void* storage, size_t storageSize);
-
 extern SkBlitter* SkBlitter_ChooseD565(const SkBitmap& device,
                                        const SkPaint& paint,
                                        void* storage, size_t storageSize);
 
 #endif