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

ui/gl/gl_fence.cc

Index: ui/gl/gl_fence.cc
diff --git a/ui/gl/gl_fence.cc b/ui/gl/gl_fence.cc
index 0fb3a743309c588cf688e13915b83a420179b0c3..c119aa0111e28df229128f64d6321be171744c77 100644
--- a/ui/gl/gl_fence.cc
+++ b/ui/gl/gl_fence.cc
@@ -13,10 +13,6 @@
 #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() {
@@ -28,11 +24,7 @@ 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;
 }
 
@@ -45,13 +37,8 @@ GLFence* GLFence::Create() {
   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);
   }