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

ash/sticky_keys/sticky_keys_overlay.cc

 // Copyright 2014 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/sticky_keys/sticky_keys_overlay.h"
 
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/sticky_keys/sticky_keys_controller.h"
 #include "base/strings/string_util.h"
@@ skipping 209 matching lines @@
 //  StickyKeysOverlay
 StickyKeysOverlay::StickyKeysOverlay()
     : is_visible_(false),
       overlay_view_(new StickyKeysOverlayView),
       widget_size_(overlay_view_->GetPreferredSize()) {
   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 = overlay_view_;
   params.bounds = CalculateOverlayBounds();
   params.parent = Shell::GetContainer(Shell::GetTargetRootWindow(),
                                       kShellWindowId_OverlayContainer);
   overlay_widget_.reset(new views::Widget);
   overlay_widget_->Init(params);
   overlay_widget_->SetVisibilityChangedAnimationsEnabled(false);
   overlay_widget_->SetContentsView(overlay_view_);
@@ skipping 72 matching lines @@
   ui::LayerAnimator* animator = overlay_widget_->GetLayer()->GetAnimator();
   if (animator)
     animator->RemoveObserver(this);
 }
 
 void StickyKeysOverlay::OnLayerAnimationScheduled(
     ui::LayerAnimationSequence* sequence) {
 }
 
 }  // namespace ash