Shuffles and renames ash/common/wm classes

ash/aura/wm_lookup_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_lookup_aura.h"
+#include "ash/aura/wm_lookup_aura.h"
 
-#include "ash/common/wm/wm_layout_manager.h"
+#include "ash/aura/wm_root_window_controller_aura.h"
+#include "ash/aura/wm_window_aura.h"
+#include "ash/common/wm_layout_manager.h"
 #include "ash/display/window_tree_host_manager.h"
 #include "ash/shell.h"
-#include "ash/wm/aura/wm_root_window_controller_aura.h"
-#include "ash/wm/aura/wm_window_aura.h"
 
 namespace ash {
-namespace wm {
 
 WmLookupAura::WmLookupAura() {
   WmLookup::Set(this);
 }
 
 WmLookupAura::~WmLookupAura() {
   WmLookup::Set(nullptr);
 }
 
 WmRootWindowController* WmLookupAura::GetRootWindowControllerWithDisplayId(
     int64_t id) {
   return WmRootWindowControllerAura::Get(Shell::GetInstance()
                                              ->window_tree_host_manager()
                                              ->GetRootWindowForDisplayId(id));
 }
 
 WmWindow* WmLookupAura::GetWindowForWidget(views::Widget* widget) {
   return WmWindowAura::Get(widget->GetNativeWindow());
 }
 
-}  // namespace wm
 }  // namespace ash