Removing deprecated GTK-Views code.

ui/views/view_gtk.cc

-// Copyright (c) 2011 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/views/view.h"
-
-#include <gtk/gtk.h>
-
-#include "base/logging.h"
-
-namespace views {
-
-gfx::NativeViewAccessible View::GetNativeViewAccessible() {
-  NOTIMPLEMENTED();
-  return NULL;
-}
-
-int View::GetHorizontalDragThreshold() {
-  static bool determined_threshold = false;
-  static int drag_threshold = 8;
-  if (determined_threshold)
-    return drag_threshold;
-  determined_threshold = true;
-  GtkSettings* settings = gtk_settings_get_default();
-  if (!settings)
-    return drag_threshold;
-  int value = 0;
-  g_object_get(G_OBJECT(settings), "gtk-dnd-drag-threshold", &value, NULL);
-  if (value)
-    drag_threshold = value;
-  return drag_threshold;
-}
-
-int View::GetVerticalDragThreshold() {
-  // Vertical and horizontal drag threshold are the same in Gtk.
-  return GetHorizontalDragThreshold();
-}
-
-}  // namespace views