Mac: Remove NSView support

ui/gl/gl_context_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_CONTEXT_NSVIEW_H_
-#define UI_GL_GL_CONTEXT_NSVIEW_H_
-
-#import <AppKit/NSOpenGL.h>
-
-#include "base/compiler_specific.h"
-#include "base/mac/scoped_nsobject.h"
-#include "ui/gl/gl_context.h"
-
-namespace gfx {
-
-class GLSurface;
-
-// GLContextNSView encapsulates an NSView-based GLContext.  This is paired with
-// the GLSurfaceNSView class.
-class GLContextNSView : public GLContextReal {
- public:
-  explicit GLContextNSView(GLShareGroup* group);
-
-  // GLContext:
-  virtual bool Initialize(GLSurface* surface,
-                          GpuPreference gpu_preference) OVERRIDE;
-  virtual void Destroy() OVERRIDE;
-  virtual bool MakeCurrent(GLSurface* surface) OVERRIDE;
-  virtual void ReleaseCurrent(GLSurface* surface) OVERRIDE;
-  virtual bool IsCurrent(GLSurface* surface) OVERRIDE;
-  virtual void* GetHandle() OVERRIDE;
-  virtual void SetSwapInterval(int interval) OVERRIDE;
-
-  // Flush the |context_|.  Swaps buffers.
-  void FlushBuffer();
-
- private:
-  virtual ~GLContextNSView();
-
-  base::scoped_nsobject<NSOpenGLContext> context_;
-  GpuPreference gpu_preference_;
-
-  DISALLOW_COPY_AND_ASSIGN(GLContextNSView);
-};
-
-}  // namespace gfx
-
-#endif  // UI_GL_GL_CONTEXT_NSVIEW_H_