Makes ash/wm/common a library

ash/wm/aura/wm_shelf_aura.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/wm/aura/wm_shelf_aura.h"
 
 #include "ash/shelf/shelf.h"
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/wm/aura/wm_window_aura.h"
 #include "ash/wm/common/shelf/wm_shelf_observer.h"
@@ skipping 14 matching lines @@
   if (shelf_layout_manager_)
     shelf_layout_manager_->RemoveObserver(this);
 }
 
 // static
 Shelf* WmShelfAura::GetShelf(WmShelf* shelf) {
   return static_cast<WmShelfAura*>(shelf)->shelf_;
 }
 
 WmWindow* WmShelfAura::GetWindow() {
-  return WmWindow::Get(shelf_->shelf_widget());
+  return WmWindowAura::Get(shelf_->shelf_widget()->GetNativeView());
 }
 
 ShelfAlignment WmShelfAura::GetAlignment() const {
   return shelf_->alignment();
 }
 
 ShelfBackgroundType WmShelfAura::GetBackgroundType() const {
   return shelf_->shelf_widget()->GetBackgroundType();
 }
 
@@ skipping 40 matching lines @@
   FOR_EACH_OBSERVER(WmShelfObserver, observers_,
                     WillChangeVisibilityState(new_state));
 }
 
 void WmShelfAura::OnShelfIconPositionsChanged() {
   FOR_EACH_OBSERVER(WmShelfObserver, observers_, OnShelfIconPositionsChanged());
 }
 
 }  // namespace wm
 }  // namespace ash