chromeos: Rename ash::WmShelf to Shelf

ash/system/tray/system_tray.cc

 // Copyright (c) 2012 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/system/tray/system_tray.h"
 
 #include <algorithm>
 #include <map>
 #include <vector>
 
 #include "ash/key_event_watcher.h"
 #include "ash/login_status.h"
 #include "ash/public/cpp/config.h"
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/root_window_controller.h"
 #include "ash/session/session_controller.h"
-#include "ash/shelf/wm_shelf.h"
+#include "ash/shelf/shelf.h"
 #include "ash/shell.h"
 #include "ash/shell_port.h"
 #include "ash/strings/grit/ash_strings.h"
 #include "ash/system/audio/tray_audio.h"
 #include "ash/system/bluetooth/tray_bluetooth.h"
 #include "ash/system/brightness/tray_brightness.h"
 #include "ash/system/cast/tray_cast.h"
 #include "ash/system/date/tray_system_info.h"
 #include "ash/system/display_scale/tray_scale.h"
 #include "ash/system/enterprise/tray_enterprise.h"
@@ skipping 164 matching lines @@
   }
 
  private:
   SystemTray* tray_;
 
   DISALLOW_COPY_AND_ASSIGN(ActivationObserver);
 };
 
 // SystemTray
 
-SystemTray::SystemTray(WmShelf* wm_shelf) : TrayBackgroundView(wm_shelf) {
+SystemTray::SystemTray(Shelf* shelf) : TrayBackgroundView(shelf) {
   SetInkDropMode(InkDropMode::ON);
 
   // Since user avatar is on the right hand side of System tray of a
   // horizontal shelf and that is sufficient to indicate separation, no
   // separator is required.
   set_separator_visibility(false);
 }
 
 SystemTray::~SystemTray() {
   // Destroy any child views that might have back pointers before ~View().
@@ skipping 495 matching lines @@
           .work_area()
           .height();
   if (work_area_height > 0) {
     UMA_HISTOGRAM_CUSTOM_COUNTS(
         "Ash.SystemMenu.PercentageOfWorkAreaHeightCoveredByMenu",
         100 * bubble_view->height() / work_area_height, 1, 300, 100);
   }
 }
 
 }  // namespace ash