ash: Remove unnecessary utility methods from ash::Shelf

ash/common/shelf/wm_shelf.cc

 // Copyright 2016 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/common/shelf/wm_shelf.h"
 #include "ash/common/shelf/wm_shelf_observer.h"
 #include "ash/common/wm_lookup.h"
 #include "ash/shelf/shelf.h"
 #include "ash/shelf/shelf_layout_manager.h"
 #include "base/logging.h"
@@ skipping 88 matching lines @@
 
 WmDimmerView* WmShelf::CreateDimmerView(bool disable_animations_for_test) {
   return nullptr;
 }
 
 bool WmShelf::IsDimmed() const {
   return shelf_layout_manager_->shelf_widget()->GetDimsShelf();
 }
 
 bool WmShelf::IsVisible() const {
-  return shelf_->IsVisible();
+  return shelf_->shelf_widget()->IsShelfVisible();
 }
 
 void WmShelf::UpdateVisibilityState() {
   if (shelf_layout_manager_)
     shelf_layout_manager_->UpdateVisibilityState();
 }
 
 ShelfVisibilityState WmShelf::GetVisibilityState() const {
   return shelf_layout_manager_ ? shelf_layout_manager_->visibility_state()
                                : SHELF_HIDDEN;
@@ skipping 73 matching lines @@
 
 void WmShelf::OnBackgroundUpdated(ShelfBackgroundType background_type,
                                   BackgroundAnimatorChangeType change_type) {
   if (background_type == GetBackgroundType())
     return;
   FOR_EACH_OBSERVER(WmShelfObserver, observers_,
                     OnBackgroundTypeChanged(background_type, change_type));
 }
 
 }  // namespace ash