remove dead methods now that we use specials exclusively for imagefilters

src/gpu/SkGpuDevice.h

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkGpuDevice_DEFINED
 #define SkGpuDevice_DEFINED
 
@@ skipping 251 matching lines @@
 
     bool drawDashLine(const SkPoint pts[2], const SkPaint& paint);
     void drawStrokedLine(const SkPoint pts[2], const SkDraw&, const SkPaint&);
 
     static sk_sp<GrDrawContext> CreateDrawContext(GrContext*,
                                                   SkBudgeted,
                                                   const SkImageInfo&,
                                                   int sampleCount,
                                                   const SkSurfaceProps*);
 
-    void drawSpriteWithFilter(const SkDraw&, const SkBitmap&, int x, int y,
-                              const SkPaint&) override;
-
     friend class GrAtlasTextContext;
     friend class SkSurface_Gpu;      // for access to surfaceProps
     typedef SkBaseDevice INHERITED;
 };
 
 #endif