Remove unused variables, ash/ edition.

ash/sysui/sysui_application.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/sysui/sysui_application.h"
 
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 202 matching lines @@
   aura::Window* root() { return Shell::GetPrimaryRootWindow(); }
 
   void Initialize(::shell::Connector* connector,
                   const ::shell::Identity& identity) {
     InitializeResourceBundle(connector);
     aura_init_.reset(new views::AuraInit(connector, "views_mus_resources.pak"));
     MaterialDesignController::Initialize();
     window_manager_connection_ =
         views::WindowManagerConnection::Create(connector, identity);
 
-    display::Screen* screen = display::Screen::GetScreen();
-    DCHECK(screen);
-    gfx::Size size = screen->GetPrimaryDisplay().bounds().size();
-
     // Uninstall the ScreenMus installed by WindowManagerConnection, so that ash
     // installs and uses the ScreenAsh. This can be removed once ash learns to
     // talk to mus for managing displays.
     // TODO(mfomitchev): We need to fix this. http://crbug.com/607300
     display::Screen::SetScreenInstance(nullptr);
 
     // Install some hook so that the WindowTreeHostMus created for widgets can
     // be hooked up correctly.
     native_widget_factory_.reset(new NativeWidgetFactory());
 
@@ skipping 98 matching lines @@
                               mojom::WallpaperControllerRequest request) {
   mojom::WallpaperController* wallpaper_controller =
       static_cast<UserWallpaperDelegateMus*>(
           Shell::GetInstance()->user_wallpaper_delegate());
   wallpaper_controller_bindings_.AddBinding(wallpaper_controller,
                                             std::move(request));
 }
 
 }  // namespace sysui
 }  // namespace ash