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/omaha_request_params.h b/omaha_request_params.h
index 3452965..727c2ad 100644
--- a/omaha_request_params.h
+++ b/omaha_request_params.h
@@ -328,7 +328,7 @@
   bool ToMoreStableChannel() const;
 
   // Returns True if we should store the fw/ec versions based on our hwid_.
-  // Compares hwid to a set of whitelisted prefixes.
+  // Compares hwid to a set of safelisted prefixes.
   bool CollectECFWVersions() const;
 
   // Gets the machine type (e.g. "i686").