We should use UserID object to identify users instead of username.

components/autofill/core/browser/personal_data_manager.cc

Index: components/autofill/core/browser/personal_data_manager.cc
diff --git a/components/autofill/core/browser/personal_data_manager.cc b/components/autofill/core/browser/personal_data_manager.cc
index 5d234adfaac692e3be272d361ac51b9cef83bd2f..296a0e1cb78a25b3c9c8a3176fc637322579b06a 100644
--- a/components/autofill/core/browser/personal_data_manager.cc
+++ b/components/autofill/core/browser/personal_data_manager.cc
@@ -32,6 +32,7 @@
 #include "components/autofill/core/common/autofill_switches.h"
 #include "components/signin/core/browser/account_tracker_service.h"
 #include "components/signin/core/common/signin_pref_names.h"
+#include "components/user_manager/user_id.h"
 #include "third_party/libaddressinput/src/cpp/include/libaddressinput/address_data.h"
 #include "third_party/libaddressinput/src/cpp/include/libaddressinput/address_formatter.h"
 
@@ -310,11 +311,11 @@ void PersonalDataManager::OnWebDataServiceRequestDone(
                               &server_profiles_);
 
         if (!server_profiles_.empty()) {
-          std::string account_id =
-              pref_service_->GetString(::prefs::kGoogleServicesAccountId);
+          const user_manager::UserID user_id(user_manager::UserID::FromUserEmail(
+              pref_service_->GetString(::prefs::kGoogleServicesAccountId)));
           base::string16 email =
               base::UTF8ToUTF16(
-                  account_tracker_->GetAccountInfo(account_id).email);
+                  account_tracker_->GetAccountInfo(user_id.GetUserEmail()).email);
           DCHECK(!email.empty());
           for (AutofillProfile* profile : server_profiles_)
             profile->SetRawInfo(EMAIL_ADDRESS, email);