mash: Convert all of //ash/system to use WmShelf

ash/test/ash_test_base.h

 // 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.
 
 #ifndef ASH_TEST_ASH_TEST_BASE_H_
 #define ASH_TEST_ASH_TEST_BASE_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 25 matching lines @@
 
 namespace aura {
 class RootWindow;
 class Window;
 class WindowDelegate;
 }  // namespace aura
 
 namespace ash {
 class DisplayManager;
 class SystemTray;
-class WmShelf;
 
 namespace test {
 
 class AshTestHelper;
 class TestScreenshotDelegate;
 class TestSystemTrayDelegate;
 #if defined(OS_WIN)
 class TestMetroViewerProcessHost;
 #endif
 
@@ skipping 57 matching lines @@
 
   // Returns the rotation currently active for the internal display.
   static display::Display::Rotation GetCurrentInternalDisplayRotation();
 
   // Proxy to AshTestHelper::SupportsMultipleDisplays().
   static bool SupportsMultipleDisplays();
 
   // Proxy to AshTestHelper::SupportsHostWindowResize().
   static bool SupportsHostWindowResize();
 
-  // Returns the WmShelf for the primary display.
-  static WmShelf* GetPrimaryShelf();
-
   void set_start_session(bool start_session) { start_session_ = start_session; }
 
   AshTestHelper* ash_test_helper() { return ash_test_helper_.get(); }
 
   void RunAllPendingInMessageLoop();
 
   TestScreenshotDelegate* GetScreenshotDelegate();
 
   TestSystemTrayDelegate* GetSystemTrayDelegate();
 
@@ skipping 39 matching lines @@
   ~NoSessionAshTestBase() override {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(NoSessionAshTestBase);
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_ASH_TEST_BASE_H_