Fix wording to comply with respectful-code

https://source.android.com/setup/contribute/respectful-code

Test: Run unit tests
Change-Id: Ia6647c9cf3224b962286151932118093b9ad979a
diff --git a/hardware_chromeos.cc b/hardware_chromeos.cc
index 5ff1b29..3adef98 100644
--- a/hardware_chromeos.cc
+++ b/hardware_chromeos.cc
@@ -47,7 +47,7 @@
 const char kOOBECompletedMarker[] = "/home/chronos/.oobe_completed";
 
 // The stateful directory used by update_engine to store powerwash-safe files.
-// The files stored here must be whitelisted in the powerwash scripts.
+// The files stored here must be safelisted in the powerwash scripts.
 const char kPowerwashSafeDirectory[] =
     "/mnt/stateful_partition/unencrypted/preserve";