remove dst/rendertarget support for kARGB_4444_Config

src/core/SkCoreBlitters.h

Index: src/core/SkCoreBlitters.h
diff --git a/src/core/SkCoreBlitters.h b/src/core/SkCoreBlitters.h
index 823cb41b0d646ca04dfd70e17410b0e55f708bf4..9455509c483de68684056f4f8ed035bbff54c4fe 100644
--- a/src/core/SkCoreBlitters.h
+++ b/src/core/SkCoreBlitters.h
@@ -154,7 +154,7 @@ private:
 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;
@@ -180,10 +180,6 @@ private:
     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);