Update components for new prefs location.

components/signin/core/browser/signin_client.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 "components/signin/core/browser/signin_client.h"
 
 #include "base/guid.h"
 #include "base/logging.h"
-#include "base/prefs/pref_service.h"
+#include "components/prefs/pref_service.h"
 #include "components/signin/core/common/signin_pref_names.h"
 
 namespace {
 const char kEphemeralUserDeviceIDPrefix[] = "t_";
 }
 
 // static
 std::string SigninClient::GenerateSigninScopedDeviceID(bool for_ephemeral) {
   std::string guid = base::GenerateGUID();
   return for_ephemeral ? kEphemeralUserDeviceIDPrefix + guid : guid;
 }
 
 std::string SigninClient::GetOrCreateScopedDeviceIdPref(PrefService* prefs) {
   std::string signin_scoped_device_id =
       prefs->GetString(prefs::kGoogleServicesSigninScopedDeviceId);
   if (signin_scoped_device_id.empty()) {
     // If device_id doesn't exist then generate new and save in prefs.
     signin_scoped_device_id = GenerateSigninScopedDeviceID(false);
     DCHECK(!signin_scoped_device_id.empty());
     prefs->SetString(prefs::kGoogleServicesSigninScopedDeviceId,
                      signin_scoped_device_id);
   }
   return signin_scoped_device_id;
 }
 
 void SigninClient::SignOut() {
   GetPrefs()->ClearPref(prefs::kGoogleServicesSigninScopedDeviceId);
   OnSignedOut();
 }