views: Convert IsEnabled() to just enabled() since it's just a simple accessor.

ui/views/controls/combobox/native_combobox_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/controls/combobox/native_combobox_gtk.h"
 
 #include <gtk/gtk.h>
 
 #include <algorithm>
 
@@ skipping 43 matching lines @@
 }
 
 void NativeComboboxGtk::UpdateSelectedItem() {
   if (!native_view())
     return;
   gtk_combo_box_set_active(
       GTK_COMBO_BOX(native_view()), combobox_->selected_item());
 }
 
 void NativeComboboxGtk::UpdateEnabled() {
-  SetEnabled(combobox_->IsEnabled());
+  SetEnabled(combobox_->enabled());
 }
 
 int NativeComboboxGtk::GetSelectedItem() const {
   if (!native_view())
     return 0;
   return gtk_combo_box_get_active(GTK_COMBO_BOX(native_view()));
 }
 
 bool NativeComboboxGtk::IsDropdownOpen() const {
   if (!native_view())
@@ skipping 144 matching lines @@
 
 // static
 NativeComboboxWrapper* NativeComboboxWrapper::CreateWrapper(
     Combobox* combobox) {
   if (Widget::IsPureViews())
     return new NativeComboboxViews(combobox);
   return new NativeComboboxGtk(combobox);
 }
 
 }  // namespace views