[Password Manager] Fix crash in reporting sync stats.

chrome/browser/password_manager/sync_metrics.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_PASSWORD_MANAGER_SYNC_METRICS_H_
 #define CHROME_BROWSER_PASSWORD_MANAGER_SYNC_METRICS_H_
 
 #include <string>
 
 class Profile;
 
 namespace password_manager_sync_metrics {
 
 // Returns the sync username for |profile|. Returns an empty string if the
-// |profile| isn't syncing passwords.
-std::string GetPasswordSyncUsername(Profile* profile);
+// |profile| isn't syncing. It would be preferable to only return the username
+// if the user is syncing passwords, but that is not currently possible since
+// this function can be called during sync setup (http://crbug.com/393626).
+std::string GetSyncUsername(Profile* profile);
 
 // Returns true if |username| and |origin| correspond to the account which is
-// syncing passwords. Will return false if |profile| is not syncing passwords.
-bool IsPasswordSyncAccountCredential(Profile* profile,
-                                     const std::string& username,
-                                     const std::string& origin);
+// syncing. Will return false if |profile| is not syncing.
+bool IsSyncAccountCredential(Profile* profile,
+                             const std::string& username,
+                             const std::string& origin);
 
 }  // namespace password_manager_sync_metrics
 
 #endif  // CHROME_BROWSER_PASSWORD_MANAGER_SYNC_METRICS_H_