Translate: Fix broken UMA entries

chrome/browser/translate/translate_browser_metrics.h

Index: chrome/browser/translate/translate_browser_metrics.h
diff --git a/chrome/browser/translate/translate_browser_metrics.h b/chrome/browser/translate/translate_browser_metrics.h
index ae0a2e9f12c805a09ffed95c4b91a702c6dc1b7f..21ee89d105a7ec2df8cbaa7fa1b8be8649a97c1e 100644
--- a/chrome/browser/translate/translate_browser_metrics.h
+++ b/chrome/browser/translate/translate_browser_metrics.h
@@ -22,20 +22,22 @@ enum MetricsNameIndex {
 
 // When Chrome Translate is ready to translate a page, one of following reason
 // decide the next browser action.
+// Note: Don't insert any item. It will change reporting UMA value, and break
+// the UMA dashboard page. Insteads, append it at the end of enum as suggested
+// below.
 enum InitiationStatusType {
   INITIATION_STATUS_DISABLED_BY_PREFS,
   INITIATION_STATUS_DISABLED_BY_SWITCH,
   INITIATION_STATUS_DISABLED_BY_CONFIG,
   INITIATION_STATUS_LANGUAGE_IS_NOT_SUPPORTED,
-  INITIATION_STATUS_MIME_TYPE_IS_NOT_SUPPORTED,
   INITIATION_STATUS_URL_IS_NOT_SUPPORTED,
   INITIATION_STATUS_SIMILAR_LANGUAGES,
   INITIATION_STATUS_ACCEPT_LANGUAGES,
-
   INITIATION_STATUS_AUTO_BY_CONFIG,
   INITIATION_STATUS_AUTO_BY_LINK,
   INITIATION_STATUS_SHOW_INFOBAR,
-
+  INITIATION_STATUS_MIME_TYPE_IS_NOT_SUPPORTED,
+  // Insert new items here.
   INITIATION_STATUS_MAX,
 };