Moves CustomFrameViewAsh to common

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 66d5d94aa65c5911905cad5932a9dd38fdfc757c..4327934cdd3e49d6dc890ee0f044c6e8af4592b6 100644
--- a/ash/aura/wm_shell_aura.cc
+++ b/ash/aura/wm_shell_aura.cc
@@ -21,6 +21,7 @@
 #include "ash/shell.h"
 #include "ash/touch/touch_uma.h"
 #include "ash/wm/drag_window_resizer.h"
+#include "ash/wm/immersive_fullscreen_controller.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"
@@ -185,6 +186,11 @@ WmShellAura::CreateScopedDisableInternalMouseAndKeyboard() {
   return nullptr;
 }
 
+std::unique_ptr<WmImmersiveFullscreenController>
+WmShellAura::CreateImmersiveFullscreenController() {
+  return base::MakeUnique<ImmersiveFullscreenController>();
+}
+
 void WmShellAura::OnOverviewModeStarting() {
   FOR_EACH_OBSERVER(ShellObserver, *shell_observers(),
                     OnOverviewModeStarting());