Mac: Remove NSView support

ui/gl/gl_surface_nsview.h

-// 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.
-
-#ifndef UI_GL_GL_SURFACE_NSVIEW_H_
-#define UI_GL_GL_SURFACE_NSVIEW_H_
-
-#include "base/compiler_specific.h"
-#include "ui/gfx/size.h"
-#include "ui/gl/gl_surface.h"
-
-namespace gfx {
-
-class GLContextNSView;
-
-// GLSurfaceNSView provides an implementation of the the GLSurface interface
-// that is backed by an NSView.  This interface pairs with the GLContextNSView
-// class, and the NSView is expected to use this context for drawing.
-class GL_EXPORT GLSurfaceNSView : public GLSurface {
- public:
-  explicit GLSurfaceNSView(AcceleratedWidget view);
-
-  // GLSurface:
-  virtual void Destroy() OVERRIDE;
-  virtual bool IsOffscreen() OVERRIDE;
-  virtual bool SwapBuffers() OVERRIDE;
-  virtual gfx::Size GetSize() OVERRIDE;
-  virtual void* GetHandle() OVERRIDE;
-
-  // Allow the surface to call back to context when in need of |FlushBuffer|.
-  virtual bool OnMakeCurrent(GLContext* context) OVERRIDE;
-
- private:
-  virtual ~GLSurfaceNSView();
-
-  // Weak.  An |NSView*|.
-  AcceleratedWidget view_;
-
-  // Weak.  Associated context.
-  GLContextNSView* context_;
-
-  DISALLOW_COPY_AND_ASSIGN(GLSurfaceNSView);
-};
-
-}  // namespace gfx
-
-#endif  // UI_GL_GL_SURFACE_NSVIEW_H_