Fix SyncTest#testRename

chrome/android/java/src/org/chromium/chrome/browser/signin/SigninHelper.java

Index: chrome/android/java/src/org/chromium/chrome/browser/signin/SigninHelper.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/signin/SigninHelper.java b/chrome/android/java/src/org/chromium/chrome/browser/signin/SigninHelper.java
index 2bf3294333384a53749f239aaef5abb9c1ae4f55..b01572db9b24a0b3c97fa2ec8fb419dce2917dc6 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/signin/SigninHelper.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/signin/SigninHelper.java
@@ -375,6 +375,12 @@ public class SigninHelper {
         }
     }
 
+    @VisibleForTesting
+    public static void resetAccountRenameEventIndex(Context context) {
+        PreferenceManager.getDefaultSharedPreferences(context)
+                .edit().putInt(ACCOUNT_RENAME_EVENT_INDEX_PREFS_KEY, 0).apply();
+    }
+
     public static boolean checkAndClearAccountsChangedPref(Context context) {
         if (PreferenceManager.getDefaultSharedPreferences(context)
                 .getBoolean(ACCOUNTS_CHANGED_PREFS_KEY, false)) {