Remove gl_bindings_skia_in_process (dead code)

ui/gl/gl_bindings_skia_in_process.h

-// Copyright (c) 2012 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.
-
-#ifndef UI_GL_GL_BINDINGS_SKIA_IN_PROCESS_H_
-#define UI_GL_GL_BINDINGS_SKIA_IN_PROCESS_H_
-
-#include "ui/gl/gl_export.h"
-
-struct GrGLInterface;
-
-namespace gfx {
-
-// The GPU back-end for skia requires pointers to GL functions. This function
-// creates a binding for skia-gpu to the in-process GL
-GL_EXPORT GrGLInterface* CreateInProcessSkiaGLBinding();
-
-}  // namespace gfx
-
-#endif  // UI_GL_GL_BINDINGS_SKIA_IN_PROCESS_H_