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

ash/wm/panels/panel_layout_manager.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 "ash/wm/panels/panel_layout_manager.h"
 
 #include <algorithm>
 #include <map>
 
 #include "ash/screen_util.h"
@@ skipping 211 matching lines @@
       background_->set_alignment(alignment);
       SchedulePaintInRect(gfx::Rect(gfx::Point(), callout_bounds.size()));
     }
   }
 
  private:
   void InitWidget(aura::Window* parent) {
     views::Widget::InitParams params;
     params.type = views::Widget::InitParams::TYPE_POPUP;
     params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
-    params.can_activate = false;
     params.keep_on_top = true;
     params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
     params.parent = parent;
     params.bounds = ScreenUtil::ConvertRectToScreen(parent, gfx::Rect());
     params.bounds.set_width(kArrowWidth);
     params.bounds.set_height(kArrowHeight);
     params.accept_events = false;
-    // Why do we need this and can_activate = false?
     set_focus_on_creation(false);
     Init(params);
     DCHECK_EQ(GetNativeView()->GetRootWindow(), parent->GetRootWindow());
     views::View* content_view = new views::View;
     background_ = new CalloutWidgetBackground;
     content_view->set_background(background_);
     SetContentsView(content_view);
     GetNativeWindow()->layer()->SetOpacity(0);
   }
 
@@ skipping 646 matching lines @@
 // keyboard::KeyboardControllerObserver implementation:
 
 void PanelLayoutManager::OnKeyboardBoundsChanging(
     const gfx::Rect& keyboard_bounds) {
   // This bounds change will have caused a change to the Shelf which does not
   // propogate automatically to this class, so manually recalculate bounds.
   OnWindowResized();
 }
 
 }  // namespace ash