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

ui/gl/gl_image_io_surface.cc

Index: ui/gl/gl_image_io_surface.cc
diff --git a/ui/gl/gl_image_io_surface.cc b/ui/gl/gl_image_io_surface.cc
deleted file mode 100644
index 9d27a290d32a7bc2597a8d25247ef87fe470b450..0000000000000000000000000000000000000000
--- a/ui/gl/gl_image_io_surface.cc
+++ /dev/null
@@ -1,75 +0,0 @@
-// Copyright 2013 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_image_io_surface.h"
-
-#include "ui/gl/gl_bindings.h"
-#include "ui/gl/gl_context.h"
-
-// Note that this must be included after gl_bindings.h to avoid conflicts.
-#include <OpenGL/CGLIOSurface.h>
-
-namespace gfx {
-
-GLImageIOSurface::GLImageIOSurface(const gfx::Size& size) : size_(size) {
-}
-
-GLImageIOSurface::~GLImageIOSurface() {
-  DCHECK(!io_surface_);
-}
-
-bool GLImageIOSurface::Initialize(IOSurfaceRef io_surface) {
-  DCHECK(!io_surface_);
-  io_surface_.reset(io_surface);
-  return true;
-}
-
-void GLImageIOSurface::Destroy(bool have_context) {
-  io_surface_.reset();
-}
-
-gfx::Size GLImageIOSurface::GetSize() { return size_; }
-
-bool GLImageIOSurface::BindTexImage(unsigned target) {
-  if (target != GL_TEXTURE_RECTANGLE_ARB) {
-    // This might be supported in the future. For now, perform strict
-    // validation so we know what's going on.
-    LOG(ERROR) << "IOSurface requires TEXTURE_RECTANGLE_ARB target";
-    return false;
-  }
-
-  CGLContextObj cgl_context =
-      static_cast<CGLContextObj>(GLContext::GetCurrent()->GetHandle());
-
-  DCHECK(io_surface_);
-  CGLError cgl_error = CGLTexImageIOSurface2D(cgl_context,
-                                              target,
-                                              GL_RGBA,
-                                              size_.width(),
-                                              size_.height(),
-                                              GL_BGRA,
-                                              GL_UNSIGNED_INT_8_8_8_8_REV,
-                                              io_surface_.get(),
-                                              0);
-  if (cgl_error != kCGLNoError) {
-    LOG(ERROR) << "Error in CGLTexImageIOSurface2D";
-    return false;
-  }
-
-  return true;
-}
-
-bool GLImageIOSurface::CopyTexImage(unsigned target) {
-  return false;
-}
-
-bool GLImageIOSurface::ScheduleOverlayPlane(gfx::AcceleratedWidget widget,
-                                            int z_order,
-                                            OverlayTransform transform,
-                                            const Rect& bounds_rect,
-                                            const RectF& crop_rect) {
-  return false;
-}
-
-}  // namespace gfx