Revert "Disable ChangedThrows"

This reverts commit 4d6f55f9c1bd7129dca59595bc98247c2f843490.

Reason for revert: No longer needed
Bug: 217545629

Change-Id: I51978bf3a27a48bec890e044b9989ea46991a9be
diff --git a/api/Android.bp b/api/Android.bp
index 2c6cade..15356bd 100644
--- a/api/Android.bp
+++ b/api/Android.bp
@@ -93,7 +93,6 @@
 // Silence reflection warnings. See b/168689341
 metalava_cmd += " -J--add-opens=java.base/java.util=ALL-UNNAMED "
 metalava_cmd += " --quiet --no-banner --format=v2 "
-metalava_cmd += " --hide ChangedThrows "
 
 genrule {
     name: "current-api-xml",