Made session restore block about:flags driven browser restart.

chrome/browser/chromeos/login/oauth2_login_manager.h

Index: chrome/browser/chromeos/login/oauth2_login_manager.h
diff --git a/chrome/browser/chromeos/login/oauth2_login_manager.h b/chrome/browser/chromeos/login/oauth2_login_manager.h
index d0a4ae3869af2e50f8f7b869e635eae6753ef2fd..532f76ec7338d4ac5eedbfc68e31fe8e529c1633 100644
--- a/chrome/browser/chromeos/login/oauth2_login_manager.h
+++ b/chrome/browser/chromeos/login/oauth2_login_manager.h
@@ -64,6 +64,10 @@ class OAuth2LoginManager : public BrowserContextKeyedService,
     // Raised when merge session state changes.
     virtual void OnSessionRestoreStateChanged(Profile* user_profile,
                                               SessionRestoreState state) {}
+
+    // Raised when a new OAuth2 refresh token is avaialble.
+    virtual void OnNewRefreshTokenAvaiable(Profile* user_profile) {}
+
     // Raised when session's GAIA credentials (SID+LSID) are available to
     // other signed in services.
     virtual void OnSessionAuthenticated(Profile* user_profile) {}