Moves maintaining ShellObservers back to Shell

ash/root_window_controller.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/root_window_controller.h"
 
 #include <algorithm>
 #include <queue>
 #include <vector>
 
@@ skipping 368 matching lines @@
   if (docked_window_layout_manager_) {
     docked_window_layout_manager_->SetShelf(wm_shelf_.get());
     if (wm_shelf_->shelf_layout_manager())
       docked_window_layout_manager_->AddObserver(
           wm_shelf_->shelf_layout_manager());
   }
 
   // Notify shell observers that the shelf has been created.
   // TODO(jamescook): Move this into WmShelf::InitializeShelf(). This will
   // require changing AttachedPanelWidgetTargeter's access to WmShelf.
-  WmShell::Get()->NotifyShelfCreatedForRootWindow(
+  Shell::GetInstance()->NotifyShelfCreatedForRootWindow(
       WmWindow::Get(GetRootWindow()));
 
   wm_shelf_->shelf_widget()->PostCreateShelf();
 }
 
 ShelfLayoutManager* RootWindowController::GetShelfLayoutManager() {
   return wm_shelf_->shelf_layout_manager();
 }
 
 SystemModalContainerLayoutManager*
@@ skipping 144 matching lines @@
   if (animating_wallpaper_widget_controller()) {
     WallpaperWidgetController* controller =
         animating_wallpaper_widget_controller()->GetController(true);
     DCHECK_EQ(controller->widget(), widget);
     // Release the old controller and close its wallpaper widget.
     SetWallpaperWidgetController(controller);
   }
 }
 
 void RootWindowController::Shutdown() {
-  WmShell::Get()->RemoveShellObserver(this);
+  Shell::GetInstance()->RemoveShellObserver(this);
 
   touch_exploration_manager_.reset();
 
   ResetRootForNewWindowsIfNecessary();
 
   CloseChildWindows();
   aura::Window* root_window = GetRootWindow();
   GetRootWindowSettings(root_window)->controller = nullptr;
   // Forget with the display ID so that display lookup
   // ends up with invalid display.
@@ skipping 108 matching lines @@
       GetContainer(kShellWindowId_VirtualKeyboardContainer)) {
     return;
   }
   DCHECK(keyboard_controller);
   keyboard_controller->AddObserver(wm_shelf_->shelf_layout_manager());
   keyboard_controller->AddObserver(panel_layout_manager());
   keyboard_controller->AddObserver(docked_window_layout_manager());
   keyboard_controller->AddObserver(workspace_controller()->layout_manager());
   keyboard_controller->AddObserver(
       always_on_top_controller_->GetLayoutManager());
-  WmShell::Get()->NotifyVirtualKeyboardActivated(true);
+  Shell::GetInstance()->NotifyVirtualKeyboardActivated(true);
   aura::Window* parent = GetContainer(kShellWindowId_ImeWindowParentContainer);
   DCHECK(parent);
   aura::Window* keyboard_container = keyboard_controller->GetContainerWindow();
   keyboard_container->set_id(kShellWindowId_VirtualKeyboardContainer);
   parent->AddChild(keyboard_container);
 }
 
 void RootWindowController::DeactivateKeyboard(
     keyboard::KeyboardController* keyboard_controller) {
   if (!keyboard_controller ||
@@ skipping 10 matching lines @@
     keyboard_controller->HideKeyboard(
         keyboard::KeyboardController::HIDE_REASON_AUTOMATIC);
     parent->RemoveChild(keyboard_container);
     keyboard_controller->RemoveObserver(wm_shelf_->shelf_layout_manager());
     keyboard_controller->RemoveObserver(panel_layout_manager());
     keyboard_controller->RemoveObserver(docked_window_layout_manager());
     keyboard_controller->RemoveObserver(
         workspace_controller()->layout_manager());
     keyboard_controller->RemoveObserver(
         always_on_top_controller_->GetLayoutManager());
-    WmShell::Get()->NotifyVirtualKeyboardActivated(false);
+    Shell::GetInstance()->NotifyVirtualKeyboardActivated(false);
   }
 }
 
 bool RootWindowController::IsVirtualKeyboardWindow(aura::Window* window) {
   aura::Window* parent = GetContainer(kShellWindowId_ImeWindowParentContainer);
   return parent ? parent->Contains(window) : false;
 }
 
 void RootWindowController::SetTouchAccessibilityAnchorPoint(
     const gfx::Point& anchor_point) {
@@ skipping 72 matching lines @@
 
   InitLayoutManagers();
   InitTouchHuds();
 
   if (wm_shell->GetPrimaryRootWindowController()
           ->GetSystemModalLayoutManager(nullptr)
           ->has_window_dimmer()) {
     GetSystemModalLayoutManager(nullptr)->CreateModalBackground();
   }
 
-  wm_shell->AddShellObserver(this);
+  shell->AddShellObserver(this);
 
   root_window_layout_manager_->OnWindowResized();
   if (root_window_type == RootWindowType::PRIMARY) {
     if (!wm_shell->IsRunningInMash())
       shell->InitKeyboard();
   } else {
     window_tree_host_->Show();
 
     // Create a shelf if a user is already logged in.
     if (wm_shell->GetSessionStateDelegate()->NumberOfLoggedInUsers())
@@ skipping 337 matching lines @@
     EnableTouchHudProjection();
   else
     DisableTouchHudProjection();
 }
 
 RootWindowController* GetRootWindowController(const aura::Window* root_window) {
   return root_window ? GetRootWindowSettings(root_window)->controller : nullptr;
 }
 
 }  // namespace ash