Fix incorrect use of AXState caused when refactoring two enums into one.

ui/views/controls/button/checkbox.cc

 // 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/views/controls/button/checkbox.h"
 
 #include "grit/ui_resources.h"
 #include "ui/accessibility/ax_view_state.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/views/controls/button/label_button_border.h"
@@ skipping 79 matching lines @@
                                   width() - rect.right())));
 }
 
 const char* Checkbox::GetClassName() const {
   return kViewClassName;
 }
 
 void Checkbox::GetAccessibleState(ui::AXViewState* state) {
   LabelButton::GetAccessibleState(state);
   state->role = ui::AX_ROLE_CHECK_BOX;
-  state->state = checked() ? ui::AX_STATE_CHECKED : 0;
+  if (checked())
+    state->AddStateFlag(ui::AX_STATE_CHECKED);
 }
 
 void Checkbox::OnFocus() {
   LabelButton::OnFocus();
   UpdateImage();
 }
 
 void Checkbox::OnBlur() {
   LabelButton::OnBlur();
   UpdateImage();
@@ skipping 26 matching lines @@
 ui::NativeTheme::Part Checkbox::GetThemePart() const {
   return ui::NativeTheme::kCheckbox;
 }
 
 void Checkbox::GetExtraParams(ui::NativeTheme::ExtraParams* params) const {
   LabelButton::GetExtraParams(params);
   params->button.checked = checked_;
 }
 
 }  // namespace views