Removes WmRootWindowController subclasses

ash/shell.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/shell.h"
 
 #include <algorithm>
 #include <string>
 #include <utility>
 
@@ skipping 155 matching lines @@
   }
 
   DISALLOW_COPY_AND_ASSIGN(AshVisibilityController);
 };
 
 }  // namespace
 
 // static
 Shell* Shell::instance_ = nullptr;
 // static
+aura::WindowTreeClient* Shell::window_tree_client_ = nullptr;
+// static
 bool Shell::initially_hide_cursor_ = false;
 
 ////////////////////////////////////////////////////////////////////////////////
 // Shell, public:
 
 // static
 Shell* Shell::CreateInstance(const ShellInitParams& init_params) {
   CHECK(!instance_);
   instance_ = new Shell(init_params.delegate);
   instance_->Init(init_params);
@@ skipping 667 matching lines @@
 std::unique_ptr<ui::EventTargetIterator> Shell::GetChildIterator() const {
   return std::unique_ptr<ui::EventTargetIterator>();
 }
 
 ui::EventTargeter* Shell::GetEventTargeter() {
   NOTREACHED();
   return nullptr;
 }
 
 }  // namespace ash