Revert of Hook up ProximityAuthSystem in EasyUnlockService.

chrome/browser/signin/chrome_proximity_auth_client.cc

 // Copyright 2015 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/chrome_proximity_auth_client.h"
 
 #include "base/logging.h"
 #include "base/prefs/pref_service.h"
 #include "base/sys_info.h"
 #include "base/version.h"
@@ skipping 87 matching lines @@
   const std::vector<uint32_t>& version_components =
       base::Version(version_info::GetVersionNumber()).components();
   if (version_components.size() > 0)
     device_classifier.set_device_software_version_code(version_components[0]);
 
   device_classifier.set_device_software_package(version_info::GetProductName());
   return device_classifier;
 }
 
 std::string ChromeProximityAuthClient::GetAccountId() {
-  // There is no SigninManager for the login profile.
-  if (!SigninManagerFactory::GetForProfile(profile_))
-    return std::string();
-
   return SigninManagerFactory::GetForProfile(profile_)
       ->GetAuthenticatedAccountId();
 }
 
 proximity_auth::CryptAuthEnrollmentManager*
 ChromeProximityAuthClient::GetCryptAuthEnrollmentManager() {
   EasyUnlockServiceRegular* easy_unlock_service = GetEasyUnlockServiceRegular();
   if (!easy_unlock_service)
     return nullptr;
   return easy_unlock_service->GetCryptAuthEnrollmentManager();
 }
 
 proximity_auth::CryptAuthDeviceManager*
 ChromeProximityAuthClient::GetCryptAuthDeviceManager() {
   EasyUnlockServiceRegular* easy_unlock_service = GetEasyUnlockServiceRegular();
   if (!easy_unlock_service)
     return nullptr;
   return easy_unlock_service->GetCryptAuthDeviceManager();
 }
 
 EasyUnlockServiceRegular*
 ChromeProximityAuthClient::GetEasyUnlockServiceRegular() {
   EasyUnlockService* easy_unlock_service = EasyUnlockService::Get(profile_);
   if (easy_unlock_service->GetType() == EasyUnlockService::TYPE_REGULAR)
     return static_cast<EasyUnlockServiceRegular*>(easy_unlock_service);
   else
     return nullptr;
 }