Revert of Switch SkBlurImageFilter over to new onFilterImage interface

src/gpu/SkGpuDevice.h

Index: src/gpu/SkGpuDevice.h
diff --git a/src/gpu/SkGpuDevice.h b/src/gpu/SkGpuDevice.h
index 81bbedbd672525046f23f5f312093f5a14110dc0..e57da44c692755365322490cd3786d91faa35e84 100644
--- a/src/gpu/SkGpuDevice.h
+++ b/src/gpu/SkGpuDevice.h
@@ -262,9 +262,6 @@
     static GrRenderTarget* CreateRenderTarget(GrContext*, SkBudgeted, const SkImageInfo&,
                                               int sampleCount, GrTextureStorageAllocator);
 
-    void drawBitmapAsSpriteWithImageFilter(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;