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

ash/wm/dock/docked_window_layout_manager.cc

 // Copyright (c) 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/wm/dock/docked_window_layout_manager.h"
 
 #include "ash/ash_switches.h"
 #include "ash/screen_util.h"
 #include "ash/shelf/shelf.h"
 #include "ash/shelf/shelf_constants.h"
@@ skipping 120 matching lines @@
   virtual void UpdateBackground(int alpha) OVERRIDE {
     alpha_ = alpha;
     SchedulePaintInRect(gfx::Rect(GetWindowBoundsInScreen().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 = false;
     params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
     params.parent = parent;
     params.accept_events = false;
     set_focus_on_creation(false);
     Init(params);
     SetVisibilityChangedAnimationsEnabled(false);
     GetNativeWindow()->SetProperty(kStayInSameRootWindowKey, true);
     opaque_background_.SetColor(SK_ColorBLACK);
     opaque_background_.SetBounds(gfx::Rect(GetWindowBoundsInScreen().size()));
@@ skipping 1170 matching lines @@
 
 void DockedWindowLayoutManager::OnKeyboardBoundsChanging(
     const gfx::Rect& keyboard_bounds) {
   // This bounds change will have caused a change to the Shelf which does not
   // propagate automatically to this class, so manually recalculate bounds.
   Relayout();
   UpdateDockBounds(DockedWindowLayoutManagerObserver::KEYBOARD_BOUNDS_CHANGING);
 }
 
 }  // namespace ash