Move MaximizeModeWindowManager to the controller

ash/system/chromeos/rotation/tray_rotation_lock.cc

Index: ash/system/chromeos/rotation/tray_rotation_lock.cc
diff --git a/ash/system/chromeos/rotation/tray_rotation_lock.cc b/ash/system/chromeos/rotation/tray_rotation_lock.cc
index 293299ad20a1a41107f35bd1bca5b13eaeef9563..a2283a7abfe7e8ee340cf1b02d7eb60f48ad5520 100644
--- a/ash/system/chromeos/rotation/tray_rotation_lock.cc
+++ b/ash/system/chromeos/rotation/tray_rotation_lock.cc
@@ -44,7 +44,8 @@ class RotationLockDefaultView : public TrayItemMore,
 RotationLockDefaultView::RotationLockDefaultView(SystemTrayItem* owner)
     : TrayItemMore(owner, false) {
   UpdateImage();
-  SetVisible(Shell::GetInstance()->IsMaximizeModeWindowManagerEnabled());
+  SetVisible(Shell::GetInstance()->maximize_mode_controller()->
+                 IsMaximizeModeWindowManagerEnabled());
   Shell::GetInstance()->AddShellObserver(this);
 }
 
@@ -131,9 +132,11 @@ void TrayRotationLock::OnMaximizeModeEnded() {
 }
 
 bool TrayRotationLock::GetInitialVisibility() {
+  MaximizeModeController* controller = Shell::GetInstance()->
+      maximize_mode_controller();
   return on_primary_display_ &&
-         Shell::GetInstance()->IsMaximizeModeWindowManagerEnabled() &&
-         Shell::GetInstance()->maximize_mode_controller()->rotation_locked();
+         controller->IsMaximizeModeWindowManagerEnabled() &&
+         controller->rotation_locked();
 }
 
 }  // namespace ash