Make sure GetAuthenticatedAccountId() returns a canonicalized id.

components/signin/core/browser/signin_manager_base.cc

Index: components/signin/core/browser/signin_manager_base.cc
diff --git a/components/signin/core/browser/signin_manager_base.cc b/components/signin/core/browser/signin_manager_base.cc
index 8d6f3096cb95b86231557acfa8c1c478d3d8824b..2fb87a59068e70b451aca750a3f050ba98a34b74 100644
--- a/components/signin/core/browser/signin_manager_base.cc
+++ b/components/signin/core/browser/signin_manager_base.cc
@@ -41,16 +41,8 @@ void SigninManagerBase::Initialize(PrefService* local_state) {
 
   std::string user =
       client_->GetPrefs()->GetString(prefs::kGoogleServicesUsername);
-  if (!user.empty()) {
-#if defined(OS_IOS)
-    // Prior to M38, Chrome on iOS did not normalize the email before setting
-    // it in SigninManager. |AccountReconcilor| expects the authenticated email
-    // to be normalized as it used as an account identifier and is compared
-    // to the accounts available in the cookies.
-    user = gaia::CanonicalizeEmail(gaia::SanitizeEmail(user));
-#endif
+  if (!user.empty())
     SetAuthenticatedUsername(user);
-  }
 }
 
 bool SigninManagerBase::IsInitialized() const { return initialized_; }
@@ -59,12 +51,12 @@ bool SigninManagerBase::IsSigninAllowed() const {
   return client_->GetPrefs()->GetBoolean(prefs::kSigninAllowed);
 }
 
-const std::string& SigninManagerBase::GetAuthenticatedUsername() const {
+std::string SigninManagerBase::GetAuthenticatedUsername() const {
   return authenticated_username_;
 }
 
-const std::string& SigninManagerBase::GetAuthenticatedAccountId() const {
-  return GetAuthenticatedUsername();
+std::string SigninManagerBase::GetAuthenticatedAccountId() const {
+  return authenticated_account_id_;
 }
 
 void SigninManagerBase::SetAuthenticatedUsername(const std::string& username) {
@@ -91,6 +83,8 @@ void SigninManagerBase::SetAuthenticatedUsername(const std::string& username) {
   DCHECK(pref_username.empty() || gaia::AreEmailsSame(username, pref_username))
       << "username: " << username << "; pref_username: " << pref_username;
   authenticated_username_ = username;
+  authenticated_account_id_ =
+      gaia::CanonicalizeEmail(gaia::SanitizeEmail(GetAuthenticatedUsername()));
   client_->GetPrefs()->SetString(prefs::kGoogleServicesUsername, username);
   NotifyDiagnosticsObservers(USERNAME, username);
 
@@ -100,12 +94,13 @@ void SigninManagerBase::SetAuthenticatedUsername(const std::string& username) {
   client_->GetPrefs()->SetString(prefs::kGoogleServicesLastUsername, username);
 }
 
-void SigninManagerBase::clear_authenticated_username() {
+void SigninManagerBase::ClearAuthenticatedUsername() {
   authenticated_username_.clear();
+  authenticated_account_id_.clear();
 }
 
 bool SigninManagerBase::IsAuthenticated() const {
-  return !GetAuthenticatedAccountId().empty();
+  return !authenticated_account_id_.empty();
 }
 
 bool SigninManagerBase::AuthInProgress() const {