Remove unused CanvasSkia::GetTextureID() functions.

ui/gfx/canvas_skia_android.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gfx/canvas_skia.h"
 
 #include "base/logging.h"
 #include "ui/gfx/font.h"
 
 namespace gfx {
 
 // static
 void CanvasSkia::SizeStringInt(const string16& text,
                                const gfx::Font& font,
                                int* width, int* height, int flags) {
   NOTIMPLEMENTED();
 }
 
 void CanvasSkia::DrawStringInt(const string16& text,
                                const gfx::Font& font,
                                const SkColor& color,
                                int x, int y, int w, int h,
                                int flags) {
   NOTIMPLEMENTED();
 }
 
-ui::TextureID CanvasSkia::GetTextureID() {
-  NOTIMPLEMENTED();
-  return 0;
-}
-
 }  // namespace gfx