Revert "Files.app: Add UMA for HardUnplugged events."

chrome/browser/chromeos/extensions/file_manager/device_event_router.h

Index: chrome/browser/chromeos/extensions/file_manager/device_event_router.h
diff --git a/chrome/browser/chromeos/extensions/file_manager/device_event_router.h b/chrome/browser/chromeos/extensions/file_manager/device_event_router.h
index e9390eef78419f888f9c483fdffa21197a77d889..8c851140f64a07d5b17f9fc3ce4366c1fa07803f 100644
--- a/chrome/browser/chromeos/extensions/file_manager/device_event_router.h
+++ b/chrome/browser/chromeos/extensions/file_manager/device_event_router.h
@@ -96,11 +96,6 @@ class DeviceEventRouter : public VolumeManagerObserver,
   // Thread checker.
   base::ThreadChecker thread_checker_;
 
-  // Last event time for UMA.
-  // TODO(hirono): Remove the temporarily UMA.  crbug.com/433734
-  base::Time last_hard_unplugged_;
-  base::Time last_suspend_done_;
-
   // Note: This should remain the last member so it'll be destroyed and
   // invalidate the weak pointers before any other members are destroyed.
   base::WeakPtrFactory<DeviceEventRouter> weak_factory_;