Mac: Remove NSView support

ui/gl/gl_surface_nsview.mm

-// 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_surface_nsview.h"
-
-#import <AppKit/NSOpenGL.h>
-#import <AppKit/NSView.h>
-
-#include "base/debug/trace_event.h"
-#include "ui/gl/gl_context_nsview.h"
-
-namespace gfx {
-
-GLSurfaceNSView::GLSurfaceNSView(AcceleratedWidget view)
-    : view_(view),
-      context_(NULL) {
-}
-
-GLSurfaceNSView::~GLSurfaceNSView() {
-}
-
-void GLSurfaceNSView::Destroy() {
-}
-
-bool GLSurfaceNSView::IsOffscreen() {
-  return false;
-}
-
-bool GLSurfaceNSView::SwapBuffers() {
-  TRACE_EVENT2("gpu", "GLSurfaceNSView:RealSwapBuffers",
-      "width", GetSize().width(),
-      "height", GetSize().height());
-  context_->FlushBuffer();
-  return true;
-}
-
-gfx::Size GLSurfaceNSView::GetSize() {
-  return gfx::Size(NSSizeToCGSize([view_ bounds].size));
-}
-
-void* GLSurfaceNSView::GetHandle() {
-  return view_;
-}
-
-bool GLSurfaceNSView::OnMakeCurrent(GLContext* context) {
-  context_ = static_cast<GLContextNSView *>(context);
-  return true;
-}
-
-}  // namespace gfx