SF: Remove StrongTyping in favor of FTL mixins

Bug: 185536303
Test: presubmit
Change-Id: I1a14abc565c5995c36fdd98c9fd35502b2ccceee
diff --git a/services/surfaceflinger/Scheduler/VSyncDispatchTimerQueue.h b/services/surfaceflinger/Scheduler/VSyncDispatchTimerQueue.h
index 30e5242..81c746e 100644
--- a/services/surfaceflinger/Scheduler/VSyncDispatchTimerQueue.h
+++ b/services/surfaceflinger/Scheduler/VSyncDispatchTimerQueue.h
@@ -158,7 +158,7 @@
     nsecs_t const mTimerSlack;
     nsecs_t const mMinVsyncDistance;
 
-    size_t mCallbackToken GUARDED_BY(mMutex) = 0;
+    CallbackToken mCallbackToken GUARDED_BY(mMutex);
 
     CallbackMap mCallbacks GUARDED_BY(mMutex);
     nsecs_t mIntendedWakeupTime GUARDED_BY(mMutex) = kInvalidTime;