Enables ScreenPinningController for mash/mus

ash/aura/wm_shell_aura.cc

Index: ash/aura/wm_shell_aura.cc
diff --git a/ash/aura/wm_shell_aura.cc b/ash/aura/wm_shell_aura.cc
index 90e5bd4dd8ec1e1bd461f9a5e4b83ae0912f6415..60f0263827790778d82b1c6f95b8bd6c00cde002 100644
--- a/ash/aura/wm_shell_aura.cc
+++ b/ash/aura/wm_shell_aura.cc
@@ -31,7 +31,6 @@
 #include "ash/virtual_keyboard_controller.h"
 #include "ash/wm/drag_window_resizer.h"
 #include "ash/wm/maximize_mode/maximize_mode_event_handler_aura.h"
-#include "ash/wm/screen_pinning_controller.h"
 #include "ash/wm/window_cycle_event_filter_aura.h"
 #include "ash/wm/window_util.h"
 #include "ash/wm/workspace/workspace_event_handler_aura.h"
@@ -141,15 +140,6 @@ void WmShellAura::SetDisplayWorkAreaInsets(WmWindow* window,
       ->UpdateWorkAreaOfDisplayNearestWindow(window->aura_window(), insets);
 }
 
-bool WmShellAura::IsPinned() {
-  return Shell::GetInstance()->screen_pinning_controller()->IsPinned();
-}
-
-void WmShellAura::SetPinnedWindow(WmWindow* window) {
-  return Shell::GetInstance()->screen_pinning_controller()->SetPinnedWindow(
-      window);
-}
-
 void WmShellAura::LockCursor() {
   Shell::GetInstance()->cursor_manager()->LockCursor();
 }