ash: Remove ash::Shelf in favor of ash::WmShelf

ash/common/shelf/shelf.cc

-// Copyright 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/common/shelf/shelf.h"
-
-#include "ash/common/shelf/shelf_delegate.h"
-#include "ash/common/shelf/wm_shelf.h"
-#include "ash/common/wm_root_window_controller.h"
-#include "ash/common/wm_shell.h"
-#include "ash/common/wm_window.h"
-
-namespace ash {
-
-Shelf::Shelf(WmShelf* wm_shelf,
-             ShelfView* shelf_view,
-             ShelfWidget* shelf_widget)
-    : wm_shelf_(wm_shelf),
-      shelf_widget_(shelf_widget),
-      shelf_view_(shelf_view) {
-  DCHECK(wm_shelf_);
-  DCHECK(shelf_view_);
-  DCHECK(shelf_widget_);
-}
-
-Shelf::~Shelf() {
-  WmShell::Get()->shelf_delegate()->OnShelfDestroyed(wm_shelf_);
-}
-
-// static
-Shelf* Shelf::ForPrimaryDisplay() {
-  return Shelf::ForWindow(WmShell::Get()->GetPrimaryRootWindow());
-}
-
-// static
-Shelf* Shelf::ForWindow(WmWindow* window) {
-  return window->GetRootWindowController()->GetShelf()->shelf();
-}
-
-}  // namespace ash