Move even more from WmShell to Shell

ash/common/wm/maximize_mode/maximize_mode_window_manager.cc

 // Copyright 2014 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/common/wm/maximize_mode/maximize_mode_window_manager.h"
 
 #include "ash/common/ash_switches.h"
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/wm/maximize_mode/maximize_mode_event_handler.h"
 #include "ash/common/wm/maximize_mode/maximize_mode_window_state.h"
@@ skipping 194 matching lines @@
   MaximizeAllWindows();
   AddWindowCreationObservers();
   EnableBackdropBehindTopWindowOnEachDisplay(true);
   display::Screen::GetScreen()->AddObserver(this);
   Shell::GetInstance()->AddShellObserver(this);
   event_handler_ = WmShell::Get()->CreateMaximizeModeEventHandler();
 }
 
 void MaximizeModeWindowManager::MaximizeAllWindows() {
   MruWindowTracker::WindowList windows =
-      WmShell::Get()->mru_window_tracker()->BuildWindowListIgnoreModal();
+      Shell::Get()->mru_window_tracker()->BuildWindowListIgnoreModal();
   // Add all existing Mru windows.
   for (WmWindow* window : windows)
     MaximizeAndTrackWindow(window);
 }
 
 void MaximizeModeWindowManager::RestoreAllWindows() {
   while (window_state_map_.size())
     ForgetWindow(window_state_map_.begin()->first);
 }
 
@@ skipping 97 matching lines @@
     RootWindowController* controller = root->GetRootWindowController();
     WmWindow* default_container =
         root->GetChildByShellWindowId(kShellWindowId_DefaultContainer);
     controller->workspace_controller()->SetMaximizeBackdropDelegate(
         enable ? base::MakeUnique<WorkspaceBackdropDelegate>(default_container)
                : nullptr);
   }
 }
 
 }  // namespace ash