Restart Chrome on ChromeOS as early as possible to speed up restart.

chrome/browser/chromeos/login/mock_login_utils.h

Index: chrome/browser/chromeos/login/mock_login_utils.h
diff --git a/chrome/browser/chromeos/login/mock_login_utils.h b/chrome/browser/chromeos/login/mock_login_utils.h
index f4f6e5ccf10f68146e1f114709136b21626dcbee..2953c0e92d373bafa9bf8dedfe56d6ad9e1e9731 100644
--- a/chrome/browser/chromeos/login/mock_login_utils.h
+++ b/chrome/browser/chromeos/login/mock_login_utils.h
@@ -43,6 +43,8 @@ class MockLoginUtils : public LoginUtils {
                void(Profile*, Profile*));
   MOCK_METHOD2(TransferDefaultAuthCache, void(Profile*, Profile*));
   MOCK_METHOD0(StopBackgroundFetchers, void(void));
+  MOCK_METHOD2(RestartToApplyPerSessionFlagsIfNeed,
+               bool(Profile*, bool early_restart));
 
   void DelegateToFake();
   FakeLoginUtils* GetFakeLoginUtils();