Folds methods in WmShellCommon to WmShell

ash/common/wm_shell_common.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/wm_shell_common.h"
-
-#include "ash/common/shell_observer.h"
-#include "ash/common/wm/mru_window_tracker.h"
-
-namespace ash {
-
-WmShellCommon::WmShellCommon() {}
-
-WmShellCommon::~WmShellCommon() {}
-
-void WmShellCommon::CreateMruWindowTracker() {
-  mru_window_tracker_.reset(new MruWindowTracker);
-}
-
-void WmShellCommon::DeleteMruWindowTracker() {
-  mru_window_tracker_.reset();
-}
-
-void WmShellCommon::AddShellObserver(ShellObserver* observer) {
-  shell_observers_.AddObserver(observer);
-}
-
-void WmShellCommon::RemoveShellObserver(ShellObserver* observer) {
-  shell_observers_.RemoveObserver(observer);
-}
-
-void WmShellCommon::NotifyPinnedStateChanged(WmWindow* pinned_window) {
-  FOR_EACH_OBSERVER(ShellObserver, shell_observers_,
-                    OnPinnedStateChanged(pinned_window));
-}
-
-}  // namespace ash