Give up focus if the focused view becomes unfocusable

ui/views/examples/tree_view_example.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/examples/tree_view_example.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "ui/views/controls/button/label_button.h"
 #include "ui/views/controls/menu/menu_model_adapter.h"
 #include "ui/views/controls/menu/menu_runner.h"
@@ skipping 27 matching lines @@
   model_.GetRoot()->Add(sheep_node, 0);
   sheep_node->Add(new NodeType(ASCIIToUTF16("Sheep 1"), 1), 0);
   sheep_node->Add(new NodeType(ASCIIToUTF16("Sheep 2"), 1), 1);
 
   tree_view_ = new TreeView();
   tree_view_->set_context_menu_controller(this);
   tree_view_->SetRootShown(false);
   tree_view_->SetModel(&model_);
   tree_view_->SetController(this);
   add_ = new LabelButton(this, ASCIIToUTF16("Add"));
-  add_->set_focusable(true);
+  add_->SetFocusable(true);
   remove_ = new LabelButton(this, ASCIIToUTF16("Remove"));
-  remove_->set_focusable(true);
+  remove_->SetFocusable(true);
   change_title_ = new LabelButton(this, ASCIIToUTF16("Change Title"));
-  change_title_->set_focusable(true);
+  change_title_->SetFocusable(true);
 
   GridLayout* layout = new GridLayout(container);
   container->SetLayoutManager(layout);
 
   const int tree_view_column = 0;
   ColumnSet* column_set = layout->AddColumnSet(tree_view_column);
   column_set->AddColumn(GridLayout::FILL, GridLayout::FILL,
                         1.0f, GridLayout::USE_PREF, 0, 0);
   layout->StartRow(1 /* expand */, tree_view_column);
   layout->AddView(tree_view_->CreateParentIfNecessary());
@@ skipping 100 matching lines @@
     case ID_ADD:
       AddNewNode();
       break;
     default:
       NOTREACHED();
   }
 }
 
 }  // namespace examples
 }  // namespace views