[Refactor] Consolidate the logic for whether a widget can be activated.

ash/accelerators/exit_warning_handler.cc

 // Copyright 2013 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 "ash/accelerators/exit_warning_handler.h"
 
 #include "ash/metrics/user_metrics_recorder.h"
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
 #include "ash/shell_window_ids.h"
@@ skipping 169 matching lines @@
   gfx::Size rs = root_window->bounds().size();
   gfx::Size ps = delegate->GetPreferredSize();
   gfx::Rect bounds((rs.width() - ps.width()) / 2,
                    (rs.height() - ps.height()) / 3,
                    ps.width(), ps.height());
   views::Widget::InitParams params;
   params.type = views::Widget::InitParams::TYPE_POPUP;
   params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
   params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
   params.accept_events = false;
-  params.can_activate = false;
   params.keep_on_top = true;
   params.remove_standard_frame = true;
   params.delegate = delegate;
   params.bounds = bounds;
   params.parent =
       Shell::GetContainer(root_window, kShellWindowId_SettingBubbleContainer);
   widget_.reset(new views::Widget);
   widget_->Init(params);
   widget_->SetContentsView(delegate);
   widget_->GetNativeView()->SetName("ExitWarningWindow");
   widget_->Show();
 
   delegate->NotifyAccessibilityEvent(ui::AX_EVENT_ALERT, true);
 }
 
 void ExitWarningHandler::Hide() {
   widget_.reset();
 }
 
 }  // namespace ash