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

ui/gl/gl_image_io_surface.h

Index: ui/gl/gl_image_io_surface.h
diff --git a/ui/gl/gl_image_io_surface.h b/ui/gl/gl_image_io_surface.h
deleted file mode 100644
index 8497278a058be0d5fb92899b21fc44e0005ca282..0000000000000000000000000000000000000000
--- a/ui/gl/gl_image_io_surface.h
+++ /dev/null
@@ -1,50 +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.
-
-#ifndef UI_GL_GL_IMAGE_IO_SURFACE_H_
-#define UI_GL_GL_IMAGE_IO_SURFACE_H_
-
-#include <IOSurface/IOSurfaceAPI.h>
-
-#include "base/mac/scoped_cftyperef.h"
-#include "ui/gfx/gpu_memory_buffer.h"
-#include "ui/gl/gl_image.h"
-
-namespace gfx {
-
-class GL_EXPORT GLImageIOSurface : public GLImage {
- public:
-  explicit GLImageIOSurface(const gfx::Size& size);
-
-  bool Initialize(IOSurfaceRef io_surface);
-
-  // Overridden from GLImage:
-  void Destroy(bool have_context) override;
-  gfx::Size GetSize() override;
-  bool BindTexImage(unsigned target) override;
-  void ReleaseTexImage(unsigned target) override {}
-  bool CopyTexImage(unsigned target) override;
-  void WillUseTexImage() override {}
-  void DidUseTexImage() override {}
-  void WillModifyTexImage() override {}
-  void DidModifyTexImage() override {}
-  bool ScheduleOverlayPlane(gfx::AcceleratedWidget widget,
-                            int z_order,
-                            OverlayTransform transform,
-                            const Rect& bounds_rect,
-                            const RectF& crop_rect) override;
-
- protected:
-  ~GLImageIOSurface() override;
-
- private:
-  base::ScopedCFTypeRef<IOSurfaceRef> io_surface_;
-  const gfx::Size size_;
-
-  DISALLOW_COPY_AND_ASSIGN(GLImageIOSurface);
-};
-
-}  // namespace gfx
-
-#endif  // UI_GL_GL_IMAGE_IO_SURFACE_H_