Remove unused SkImage_Base and SkImage_Gpu onNewSurface methods

src/image/SkImage_Gpu.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkImage_Gpu_DEFINED
 #define SkImage_Gpu_DEFINED
 
@@ skipping 33 matching lines @@
     sk_sp<SkImage> onMakeSubset(const SkIRect&) const override;
 
     GrTexture* peekTexture() const override { return fTexture; }
     sk_sp<GrTexture> refPinnedTexture(uint32_t* uniqueID) const override {
         *uniqueID = this->uniqueID();
         return sk_ref_sp(fTexture.get());
     }
     bool onReadPixels(const SkImageInfo&, void* dstPixels, size_t dstRowBytes,
                       int srcX, int srcY, CachingHint) const override;
 
-    sk_sp<SkSurface> onNewSurface(const SkImageInfo& info) const override {
-        return SkSurface::MakeRenderTarget(fTexture->getContext(), SkBudgeted::kNo, info);
-    }
-
 private:
     SkAutoTUnref<GrTexture>     fTexture;
     const SkAlphaType           fAlphaType;
     const SkBudgeted            fBudgeted;
     sk_sp<SkColorSpace>         fColorSpace;
     mutable SkAtomic<bool>      fAddedRasterVersionToCache;
 
 
     typedef SkImage_Base INHERITED;
 };
 
 #endif