Fix checkbox in windows uninstaller.

views/controls/button/checkbox.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 "views/controls/button/checkbox.h"
 
 #include "base/logging.h"
 #include "ui/base/accessibility/accessible_view_state.h"
 #include "ui/gfx/canvas.h"
 #include "views/controls/label.h"
@@ skipping 282 matching lines @@
                                                            extra));
   gfx::Insets insets = GetInsets();
   int y_offset = (height() - size.height()) / 2;
   gfx::Rect rect(insets.left(), y_offset, size.width(), size.height());
   rect.set_x(GetMirroredXForRect(rect));
   return rect;
 }
 
 void Checkbox::GetExtraParams(gfx::NativeTheme::ExtraParams* params) const {
   TextButtonBase::GetExtraParams(params);
-  params->button.is_default = false;
   params->button.checked = checked_;
 }
 
 gfx::Rect Checkbox::GetTextBounds() const {
   gfx::Rect bounds(TextButtonBase::GetTextBounds());
   gfx::NativeTheme::ExtraParams extra;
   gfx::NativeTheme::State state = GetThemeState(&extra);
   gfx::Size size(gfx::NativeTheme::instance()->GetPartSize(GetThemePart(),
                                                            state,
                                                            extra));
   bounds.Offset(size.width() + kCheckboxLabelSpacing, 0);
   return bounds;
 }
 
 }  // namespace views