Moves couple of WmShell methods to standalone functions

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 8f81a01f04b114e1bd0d41c59e2ce4dc612dcc39..b25ded7efac3d3360f84566118be2170826dba0d 100644
--- a/ash/mus/bridge/wm_shell_mus.cc
+++ b/ash/mus/bridge/wm_shell_mus.cc
@@ -55,8 +55,6 @@
 #include "ui/display/manager/managed_display_info.h"
 #include "ui/display/screen.h"
 #include "ui/views/mus/pointer_watcher_event_router.h"
-#include "ui/wm/core/capture_controller.h"
-#include "ui/wm/core/focus_controller.h"
 
 namespace ash {
 namespace mus {
@@ -165,23 +163,6 @@ Config WmShellMus::GetConfig() const {
   return window_manager_->config();
 }
 
-WmWindow* WmShellMus::GetFocusedWindow() {
-  // TODO: remove as both WmShells use same implementation.
-  return WmWindow::Get(
-      aura::client::GetFocusClient(Shell::GetPrimaryRootWindow())
-          ->GetFocusedWindow());
-}
-
-WmWindow* WmShellMus::GetActiveWindow() {
-  // TODO: remove as both WmShells use same implementation.
-  return WmWindow::Get(wm::GetActiveWindow());
-}
-
-WmWindow* WmShellMus::GetCaptureWindow() {
-  // TODO: remove as both WmShells use same implementation.
-  return WmWindow::Get(::wm::CaptureController::Get()->GetCaptureWindow());
-}
-
 WmWindow* WmShellMus::GetPrimaryRootWindow() {
   // NOTE: This is called before the RootWindowController has been created, so
   // it can't call through to RootWindowController to get all windows.