Make sure GetAuthenticatedAccountId() returns a canonicalized id.

components/signin/core/browser/signin_manager.cc

Index: components/signin/core/browser/signin_manager.cc
diff --git a/components/signin/core/browser/signin_manager.cc b/components/signin/core/browser/signin_manager.cc
index 8e7847e0b0ff2574b83efc043b8e00f99d6576f4..a00987a5eff8153f18984962782f4b88f0980c28 100644
--- a/components/signin/core/browser/signin_manager.cc
+++ b/components/signin/core/browser/signin_manager.cc
@@ -83,9 +83,8 @@ void SigninManager::RemoveMergeSessionObserver(
 SigninManager::~SigninManager() {}
 
 void SigninManager::InitTokenService() {
-  const std::string& account_id = GetAuthenticatedUsername();
-  if (token_service_ && !account_id.empty())
-    token_service_->LoadCredentials(account_id);
+  if (token_service_ && IsAuthenticated())
+    token_service_->LoadCredentials(GetAuthenticatedAccountId());
 }
 
 std::string SigninManager::SigninTypeToString(SigninManager::SigninType type) {
@@ -357,12 +356,12 @@ void SigninManager::CompletePendingSignin() {
 
   DCHECK(!temp_refresh_token_.empty());
   DCHECK(IsAuthenticated());
-  token_service_->UpdateCredentials(GetAuthenticatedUsername(),
-                                    temp_refresh_token_);
+  std::string account_id = GetAuthenticatedAccountId();
+  token_service_->UpdateCredentials(account_id, temp_refresh_token_);
   temp_refresh_token_.clear();
 
   if (client_->ShouldMergeSigninCredentialsIntoCookieJar())
-    merge_session_helper_->LogIn(GetAuthenticatedUsername());
+    merge_session_helper_->LogIn(account_id);
 }
 
 void SigninManager::OnExternalSigninCompleted(const std::string& username) {