Parcelable classes should always be final.

Also hide ConnectivityMetricsEvent which isn't being used yet.

Bug: 27415331
Change-Id: Iacdccddda504f3f669185f807b4f35b8dc2b0212
diff --git a/api/test-removed.txt b/api/test-removed.txt
index 50a24f6..115224c 100644
--- a/api/test-removed.txt
+++ b/api/test-removed.txt
@@ -37,7 +37,7 @@
 
 package android.media {
 
-  public class AudioFormat implements android.os.Parcelable {
+  public final class AudioFormat implements android.os.Parcelable {
     ctor public AudioFormat();
   }