Rename metrics_constants.proto DEFAULT_AUTOFILL_PICKER.

Change-Id: Idfb0c1cc42385eaea87a0c6d0aeee1f3affa155c
Test: compiles
diff --git a/proto/src/metrics_constants.proto b/proto/src/metrics_constants.proto
index 341438d..da991fc 100644
--- a/proto/src/metrics_constants.proto
+++ b/proto/src/metrics_constants.proto
@@ -3276,8 +3276,8 @@
     DEFAULT_APP_PICKER_CONFIRMATION_DIALOG = 791;
 
 
-    // OPEN: Settings > Apps > Default Apps > Default auto-fill app
-    DEFAULT_AUTO_FILL_PICKER = 792;
+    // OPEN: Settings > Apps > Default Apps > Default autofill app
+    DEFAULT_AUTOFILL_PICKER = 792;
 
     // These values should never appear in log outputs - they are reserved for
     // internal Tron use.