Remove windows/mac/ios specific code from //ui

ui/gl/gl_bindings_api_autogen_wgl.h

-// Copyright 2014 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.
-//
-// This file is auto-generated from
-// ui/gl/generate_bindings.py
-// It's formatted by clang-format using chromium coding style:
-//    clang-format -i -style=chromium filename
-// DO NOT EDIT!
-
-BOOL wglChoosePixelFormatARBFn(HDC dc,
-                               const int* int_attrib_list,
-                               const float* float_attrib_list,
-                               UINT max_formats,
-                               int* formats,
-                               UINT* num_formats) override;
-BOOL wglCopyContextFn(HGLRC hglrcSrc, HGLRC hglrcDst, UINT mask) override;
-HGLRC wglCreateContextFn(HDC hdc) override;
-HGLRC wglCreateLayerContextFn(HDC hdc, int iLayerPlane) override;
-HPBUFFERARB wglCreatePbufferARBFn(HDC hDC,
-                                  int iPixelFormat,
-                                  int iWidth,
-                                  int iHeight,
-                                  const int* piAttribList) override;
-BOOL wglDeleteContextFn(HGLRC hglrc) override;
-BOOL wglDestroyPbufferARBFn(HPBUFFERARB hPbuffer) override;
-HGLRC wglGetCurrentContextFn() override;
-HDC wglGetCurrentDCFn() override;
-const char* wglGetExtensionsStringARBFn(HDC hDC) override;
-const char* wglGetExtensionsStringEXTFn() override;
-HDC wglGetPbufferDCARBFn(HPBUFFERARB hPbuffer) override;
-BOOL wglMakeCurrentFn(HDC hdc, HGLRC hglrc) override;
-BOOL wglQueryPbufferARBFn(HPBUFFERARB hPbuffer,
-                          int iAttribute,
-                          int* piValue) override;
-int wglReleasePbufferDCARBFn(HPBUFFERARB hPbuffer, HDC hDC) override;
-BOOL wglShareListsFn(HGLRC hglrc1, HGLRC hglrc2) override;
-BOOL wglSwapIntervalEXTFn(int interval) override;
-BOOL wglSwapLayerBuffersFn(HDC hdc, UINT fuPlanes) override;