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

ui/gl/gl_implementation.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_implementation.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/at_exit.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_gl_api_implementation.h"
 
 namespace gfx {
 
 namespace {
 
 const struct {
   const char* name;
   GLImplementation implementation;
 } kGLImplementationNamePairs[] = {
   { kGLImplementationDesktopName, kGLImplementationDesktopGL },
   { kGLImplementationOSMesaName, kGLImplementationOSMesaGL },
-#if defined(OS_MACOSX)
-  { kGLImplementationAppleName, kGLImplementationAppleGL },
-#endif
   { kGLImplementationEGLName, kGLImplementationEGLGLES2 },
   { kGLImplementationMockName, kGLImplementationMockGL }
 };
 
 typedef std::vector<base::NativeLibrary> LibraryArray;
 
 GLImplementation g_gl_implementation = kGLImplementationNone;
 LibraryArray* g_libraries;
 GLGetProcAddressProc g_get_proc_address;
 
 void CleanupNativeLibraries(void* unused) {
   if (g_libraries) {
     // We do not call base::UnloadNativeLibrary() for these libraries as
     // unloading libGL without closing X display is not allowed. See
     // crbug.com/250813 for details.
     delete g_libraries;
     g_libraries = NULL;
   }
 }
 
 }
 
 base::ThreadLocalPointer<GLApi>* g_current_gl_context_tls = NULL;
 OSMESAApi* g_current_osmesa_context;
 
-#if defined(OS_WIN)
-
-EGLApi* g_current_egl_context;
-WGLApi* g_current_wgl_context;
-
-#elif defined(USE_X11)
+#if defined(USE_X11)
 
 EGLApi* g_current_egl_context;
 GLXApi* g_current_glx_context;
 
 #elif defined(USE_OZONE)
 
 EGLApi* g_current_egl_context;
 
 #elif defined(OS_ANDROID)
 
@@ skipping 88 matching lines @@
 }
 
 DisableNullDrawGLBindings::~DisableNullDrawGLBindings() {
   SetNullDrawGLBindingsEnabledGL(initial_enabled_);
 }
 
 GLWindowSystemBindingInfo::GLWindowSystemBindingInfo()
     : direct_rendering(true) {}
 
 }  // namespace gfx