settings: Add async system salt retrieval logic in DeviceOAuth2TokenServiceFactory

chrome/browser/chromeos/policy/device_cloud_policy_manager_chromeos_unittest.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/policy/device_cloud_policy_manager_chromeos.h"
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 90 matching lines @@
     manager_->Init();
 
     // DeviceOAuth2TokenService uses the system request context to fetch
     // OAuth tokens, then writes the token to local state, encrypting it
     // first with methods in CryptohomeTokenEncryptor.
     request_context_getter_ = new net::TestURLRequestContextGetter(
         loop_.message_loop_proxy());
     TestingBrowserProcess::GetGlobal()->SetSystemRequestContext(
         request_context_getter_.get());
     TestingBrowserProcess::GetGlobal()->SetLocalState(&local_state_);
+    // SystemSaltGetter is used in DeviceOAuth2TokenServiceFactory.
+    chromeos::SystemSaltGetter::Initialize();
     chromeos::DeviceOAuth2TokenServiceFactory::Initialize();
-    // This is needed as SystemSaltGetter is used for encrypting tokens in
-    // CryptohomeTokenEncryptor.
-    chromeos::SystemSaltGetter::Initialize();
     url_fetcher_response_code_ = 200;
     url_fetcher_response_string_ = "{\"access_token\":\"accessToken4Test\","
                                    "\"expires_in\":1234,"
                                    "\"refresh_token\":\"refreshToken4Test\"}";
   }
 
   virtual void TearDown() OVERRIDE {
     manager_->Shutdown();
     DeviceSettingsTestBase::TearDown();
 
@@ skipping 395 matching lines @@
 TEST_F(DeviceCloudPolicyManagerChromeOSEnrollmentTest, LoadError) {
   loaded_blob_.clear();
   RunTest();
   ExpectFailedEnrollment(EnrollmentStatus::STATUS_STORE_ERROR);
   EXPECT_EQ(CloudPolicyStore::STATUS_LOAD_ERROR,
             status_.store_status());
 }
 
 }  // namespace
 }  // namespace policy