Don't start FRE from the login screen

chrome/browser/chromeos/login/existing_user_controller.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/login/existing_user_controller.h"
 
 #include <memory>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 1295 matching lines @@
   }
 
   PerformPreLoginActions(user_context);
 
   if (!time_init_.is_null()) {
     base::TimeDelta delta = base::Time::Now() - time_init_;
     UMA_HISTOGRAM_MEDIUM_TIMES("Login.PromptToCompleteLoginTime", delta);
     time_init_ = base::Time();  // Reset to null.
   }
 
-  host_->OnCompleteLogin();
-
   if (user_context.GetAuthFlow() == UserContext::AUTH_FLOW_EASY_BOOTSTRAP) {
     bootstrap_user_context_initializer_.reset(
         new BootstrapUserContextInitializer());
     bootstrap_user_context_initializer_->Start(
         user_context.GetAuthCode(),
         base::Bind(&ExistingUserController::OnBootstrapUserContextInitialized,
                    weak_factory_.GetWeakPtr()));
     return;
   }
 
@@ skipping 107 matching lines @@
   login_display_->ShowUnrecoverableCrypthomeErrorDialog();
 }
 
 void ExistingUserController::ClearRecordedNames() {
   display_email_.clear();
   display_name_.clear();
   given_name_.clear();
 }
 
 }  // namespace chromeos