easy-signin: Wire GetSignInChallenge.

chrome/browser/signin/easy_unlock_service_regular.cc

 // Copyright 2014 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/signin/easy_unlock_service_regular.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/prefs/pref_service.h"
 #include "base/prefs/scoped_user_pref_update.h"
@@ skipping 134 matching lines @@
 void EasyUnlockServiceRegular::ResetTurnOffFlow() {
   turn_off_flow_.reset();
   SetTurnOffFlowStatus(IDLE);
 }
 
 EasyUnlockService::TurnOffFlowStatus
     EasyUnlockServiceRegular::GetTurnOffFlowStatus() const {
   return turn_off_flow_status_;
 }
 
+std::string EasyUnlockServiceRegular::GetChallenge() const {
+  return std::string();
+}
+
 void EasyUnlockServiceRegular::InitializeInternal() {
   registrar_.Init(profile()->GetPrefs());
   registrar_.Add(
       prefs::kEasyUnlockAllowed,
       base::Bind(&EasyUnlockServiceRegular::OnPrefsChanged,
                  base::Unretained(this)));
   OnPrefsChanged();
 }
 
 bool EasyUnlockServiceRegular::IsAllowedInternal() {
@@ skipping 25 matching lines @@
 
   if (!success) {
     SetTurnOffFlowStatus(FAIL);
     return;
   }
 
   ClearRemoteDevices();
   SetTurnOffFlowStatus(IDLE);
   ReloadApp();
 }