mash: Remove WmRootWindowControllerObserver.

ash/common/wm_root_window_controller.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/common/wm_root_window_controller.h"
 
 #include "ash/common/shell_window_ids.h"
 #include "ash/common/wm/root_window_layout_manager.h"
 #include "ash/common/wm/workspace/workspace_layout_manager.h"
 #include "ash/common/wm/workspace_controller.h"
@@ skipping 20 matching lines @@
 WmRootWindowController::WmRootWindowController(WmWindow* root)
     : root_(root), root_window_layout_manager_(nullptr) {}
 
 WmRootWindowController::~WmRootWindowController() {}
 
 wm::WorkspaceWindowState WmRootWindowController::GetWorkspaceWindowState() {
   return workspace_controller_ ? workspace_controller()->GetWindowState()
                                : wm::WORKSPACE_WINDOW_STATE_DEFAULT;
 }
 
-void WmRootWindowController::AddObserver(
-    WmRootWindowControllerObserver* observer) {
-  observers_.AddObserver(observer);
-}
-
-void WmRootWindowController::RemoveObserver(
-    WmRootWindowControllerObserver* observer) {
-  observers_.RemoveObserver(observer);
-}
-
 void WmRootWindowController::CreateContainers() {
   // These containers are just used by PowerButtonController to animate groups
   // of containers simultaneously without messing up the current transformations
   // on those containers. These are direct children of the root window; all of
   // the other containers are their children.
 
   // The wallpaper container is not part of the lock animation, so it is not
   // included in those animate groups. When the screen is locked, the wallpaper
   // is moved to the lock screen wallpaper container (and moved back on unlock).
   // Ensure that there's an opaque layer occluding the non-lock-screen layers.
@@ skipping 172 matching lines @@
   WmWindow* default_container =
       root_->GetChildByShellWindowId(kShellWindowId_DefaultContainer);
   workspace_controller_.reset(new WorkspaceController(default_container));
 }
 
 void WmRootWindowController::DeleteWorkspaceController() {
   workspace_controller_.reset();
 }
 
 }  // namespace ash