Give up focus if the focused view becomes unfocusable

ui/views/controls/button/label_button.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/label_button.h"
 
 #include "base/logging.h"
 #include "grit/ui_resources.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/animation/throb_animation.h"
@@ skipping 136 matching lines @@
   set_border(new LabelButtonBorder(style));
   // Inset the button focus rect from the actual border; roughly match Windows.
   if (style == STYLE_BUTTON) {
     SetFocusPainter(scoped_ptr<Painter>());
   } else {
     SetFocusPainter(Painter::CreateDashedFocusPainterWithInsets(
                         gfx::Insets(3, 3, 3, 3)));
   }
   if (style == STYLE_BUTTON || style == STYLE_NATIVE_TEXTBUTTON) {
     label_->SetHorizontalAlignment(gfx::ALIGN_CENTER);
-    set_focusable(true);
+    SetFocusable(true);
   }
   if (style == STYLE_BUTTON)
     set_min_size(gfx::Size(70, 33));
   // Invalidate the layout to pickup the new insets from the border.
   InvalidateLayout();
   ResetColorsFromNativeTheme();
 }
 
 void LabelButton::SetFocusPainter(scoped_ptr<Painter> focus_painter) {
   focus_painter_ = focus_painter.Pass();
@@ skipping 226 matching lines @@
   return ui::NativeTheme::kNormal;
 }
 
 ui::NativeTheme::State LabelButton::GetForegroundThemeState(
     ui::NativeTheme::ExtraParams* params) const {
   GetExtraParams(params);
   return ui::NativeTheme::kHovered;
 }
 
 }  // namespace views