This CL replaces e-mail with AccountId in easy signin code.

chrome/browser/signin/chrome_proximity_auth_client.cc

Index: chrome/browser/signin/chrome_proximity_auth_client.cc
diff --git a/chrome/browser/signin/chrome_proximity_auth_client.cc b/chrome/browser/signin/chrome_proximity_auth_client.cc
index a3037fd1b694eae088eb181e53266387539530b4..7ae77366b77dfca51da28ccd2a7b92923452be6e 100644
--- a/chrome/browser/signin/chrome_proximity_auth_client.cc
+++ b/chrome/browser/signin/chrome_proximity_auth_client.cc
@@ -78,8 +78,9 @@ void ChromeProximityAuthClient::GetChallengeForUserAndDevice(
   }
 
   static_cast<EasyUnlockServiceSignin*>(easy_unlock_service)
-      ->WrapChallengeForUserAndDevice(user_id, remote_public_key,
-                                      channel_binding_data, callback);
+      ->WrapChallengeForUserAndDevice(AccountId::FromUserEmail(user_id),
+                                      remote_public_key, channel_binding_data,
+                                      callback);
 #else
   callback.Run(std::string());
 #endif