This CL replaces user_manager::UserID with AccountId.

chromeos/login/auth/login_performer.cc

Index: chromeos/login/auth/login_performer.cc
diff --git a/chromeos/login/auth/login_performer.cc b/chromeos/login/auth/login_performer.cc
index ba4e82bd3b0657de4cc10d421d8b4da9ead4e0d1..b988f1d3786382e5017e1c033355d1416438b360 100644
--- a/chromeos/login/auth/login_performer.cc
+++ b/chromeos/login/auth/login_performer.cc
@@ -18,6 +18,7 @@
 #include "chromeos/login/user_names.h"
 #include "chromeos/login_event_recorder.h"
 #include "chromeos/settings/cros_settings_names.h"
+#include "components/signin/core/account_id/account_id.h"
 #include "google_apis/gaia/gaia_auth_util.h"
 #include "net/cookies/cookie_monster.h"
 #include "net/cookies/cookie_store.h"
@@ -107,7 +108,8 @@ void LoginPerformer::OnPasswordChangeDetected() {
 
 void LoginPerformer::NotifyWhitelistCheckFailure() {
   if (delegate_)
-    delegate_->WhiteListCheckFailed(user_context_.GetUserID());
+    delegate_->WhiteListCheckFailed(
+        user_context_.GetAccountId().GetUserEmail());
   else
     NOTREACHED();
 }
@@ -128,7 +130,8 @@ void LoginPerformer::PerformLogin(const UserContext& user_context,
 
 void LoginPerformer::DoPerformLogin(const UserContext& user_context,
                                     AuthorizationMode auth_mode) {
-  std::string email = gaia::CanonicalizeEmail(user_context.GetUserID());
+  const std::string email =
+      gaia::CanonicalizeEmail(user_context.GetAccountId().GetUserEmail());
   bool wildcard_match = false;
 
   if (!IsUserWhitelisted(email, &wildcard_match)) {
@@ -137,7 +140,7 @@ void LoginPerformer::DoPerformLogin(const UserContext& user_context,
   }
 
   if (user_context.GetAuthFlow() == UserContext::AUTH_FLOW_EASY_UNLOCK)
-    SetupEasyUnlockUserFlow(user_context.GetUserID());
+    SetupEasyUnlockUserFlow(user_context.GetAccountId().GetUserEmail());
 
   switch (auth_mode_) {
     case AUTH_MODE_EXTENSION: {
@@ -156,8 +159,9 @@ void LoginPerformer::DoPerformLogin(const UserContext& user_context,
 }
 
 void LoginPerformer::LoginAsSupervisedUser(const UserContext& user_context) {
-  DCHECK_EQ(chromeos::login::kSupervisedUserDomain,
-            gaia::ExtractDomainName(user_context.GetUserID()));
+  DCHECK_EQ(
+      chromeos::login::kSupervisedUserDomain,
+      gaia::ExtractDomainName(user_context.GetAccountId().GetUserEmail()));
 
   user_context_ = user_context;
   user_context_.SetUserType(user_manager::USER_TYPE_SUPERVISED);
@@ -174,11 +178,11 @@ void LoginPerformer::TrustedLoginAsSupervisedUser(
     const UserContext& user_context) {
   if (!AreSupervisedUsersAllowed()) {
     LOG(ERROR) << "Login attempt of supervised user detected.";
-    delegate_->WhiteListCheckFailed(user_context.GetUserID());
+    delegate_->WhiteListCheckFailed(user_context.GetAccountId().GetUserEmail());
     return;
   }
 
-  SetupSupervisedUserFlow(user_context.GetUserID());
+  SetupSupervisedUserFlow(user_context.GetAccountId().GetUserEmail());
   UserContext user_context_copy = TransformSupervisedKey(user_context);
 
   if (UseExtendedAuthenticatorForSupervisedUser(user_context)) {
@@ -202,7 +206,7 @@ void LoginPerformer::TrustedLoginAsSupervisedUser(
 }
 
 void LoginPerformer::LoginAsPublicSession(const UserContext& user_context) {
-  if (!CheckPolicyForUser(user_context.GetUserID())) {
+  if (!CheckPolicyForUser(user_context.GetAccountId().GetUserEmail())) {
     DCHECK(delegate_);
     if (delegate_)
       delegate_->PolicyLoadFailed();