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

components/proximity_auth/unlock_manager.h

Index: components/proximity_auth/unlock_manager.h
diff --git a/components/proximity_auth/unlock_manager.h b/components/proximity_auth/unlock_manager.h
index e978e674a4d3c2baaba07e46c86f6b2080739bac..5a6039e339bce25cecd3af85a2f8db24ee646b38 100644
--- a/components/proximity_auth/unlock_manager.h
+++ b/components/proximity_auth/unlock_manager.h
@@ -84,7 +84,7 @@ class UnlockManager : public MessengerObserver,
       ScreenlockBridge::LockHandler::ScreenType screen_type) override;
   void OnScreenDidUnlock(
       ScreenlockBridge::LockHandler::ScreenType screen_type) override;
-  void OnFocusedUserChanged(const std::string& user_id) override;
+  void OnFocusedUserChanged(const AccountId& account_id) override;
 
   // Called when the screenlock state changes.
   void OnScreenLockedOrUnlocked(bool is_locked);