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

ui/gl/gl_fence.cc

 // 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.
 
 #include "ui/gl/gl_fence.h"
 
 #include "base/compiler_specific.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_context.h"
 #include "ui/gl/gl_fence_arb.h"
 #include "ui/gl/gl_fence_egl.h"
 #include "ui/gl/gl_fence_nv.h"
 #include "ui/gl/gl_gl_api_implementation.h"
 #include "ui/gl/gl_version_info.h"
 
-#if defined(OS_MACOSX)
-#include "ui/gl/gl_fence_apple.h"
-#endif
-
 namespace gfx {
 
 GLFence::GLFence() {
 }
 
 GLFence::~GLFence() {
 }
 
 bool GLFence::IsSupported() {
   DCHECK(GetGLVersionInfo());
   return g_driver_gl.ext.b_GL_ARB_sync || GetGLVersionInfo()->is_es3 ||
-#if defined(OS_MACOSX)
-         g_driver_gl.ext.b_GL_APPLE_fence ||
-#else
          g_driver_egl.ext.b_EGL_KHR_fence_sync ||
-#endif
          g_driver_gl.ext.b_GL_NV_fence;
 }
 
 GLFence* GLFence::Create() {
   DCHECK(GLContext::GetCurrent())
       << "Trying to create fence with no context";
 
   scoped_ptr<GLFence> fence;
   // Prefer ARB_sync which supports server-side wait.
   if (g_driver_gl.ext.b_GL_ARB_sync ||
       GetGLVersionInfo()->is_es3) {
     fence.reset(new GLFenceARB);
-#if defined(OS_MACOSX)
-  } else if (g_driver_gl.ext.b_GL_APPLE_fence) {
-    fence.reset(new GLFenceAPPLE);
-#else
   } else if (g_driver_egl.ext.b_EGL_KHR_fence_sync) {
     fence.reset(new GLFenceEGL);
-#endif
   } else if (g_driver_gl.ext.b_GL_NV_fence) {
     fence.reset(new GLFenceNV);
   }
 
   DCHECK_EQ(!!fence.get(), GLFence::IsSupported());
   return fence.release();
 }
 
 }  // namespace gfx