Removes WmShell::NewWindow()

ash/mus/bridge/wm_shell_mus.cc

Index: ash/mus/bridge/wm_shell_mus.cc
diff --git a/ash/mus/bridge/wm_shell_mus.cc b/ash/mus/bridge/wm_shell_mus.cc
index e6d4b4ec7e220d794fdfb4f2aecdd479c151c743..a44787047ad29f055491fb27989f0453a3d98e4c 100644
--- a/ash/mus/bridge/wm_shell_mus.cc
+++ b/ash/mus/bridge/wm_shell_mus.cc
@@ -171,11 +171,6 @@ aura::WindowTreeClient* WmShellMus::window_tree_client() {
   return window_manager_->window_tree_client();
 }
 
-void WmShellMus::Initialize(
-    const scoped_refptr<base::SequencedWorkerPool>& pool) {
-  WmShell::Initialize(pool);
-}
-
 void WmShellMus::Shutdown() {
   WmShell::Shutdown();
 
@@ -186,14 +181,6 @@ bool WmShellMus::IsRunningInMash() const {
   return true;
 }
 
-WmWindow* WmShellMus::NewWindow(ui::wm::WindowType window_type,
-                                ui::LayerType layer_type) {
-  aura::Window* window = new aura::Window(nullptr);
-  window->SetType(window_type);
-  window->Init(layer_type);
-  return WmWindow::Get(window);
-}
-
 WmWindow* WmShellMus::GetFocusedWindow() {
   // TODO: remove as both WmShells use same implementation.
   return WmWindow::Get(