Add callback list to PrefModelAssociator after sync data is loaded

components/signin/ios/browser/account_consistency_service_unittest.mm

 // 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 "components/signin/ios/browser/account_consistency_service.h"
 
 #import <WebKit/WebKit.h>
 
 #include <memory>
 
@@ skipping 115 matching lines @@
     content_settings::CookieSettings::RegisterProfilePrefs(prefs_.registry());
     HostContentSettingsMap::RegisterProfilePrefs(prefs_.registry());
     SigninManagerBase::RegisterProfilePrefs(prefs_.registry());
 
     gaia_cookie_manager_service_.reset(new MockGaiaCookieManagerService());
     signin_client_.reset(new TestSigninClient(&prefs_));
     signin_manager_.reset(new FakeSigninManager(
         signin_client_.get(), nullptr, &account_tracker_service_, nullptr));
     account_tracker_service_.Initialize(signin_client_.get());
     settings_map_ = new HostContentSettingsMap(
-        &prefs_, false /* incognito_profile */, false /* guest_profile */);
+        &prefs_, false /* incognito_profile */, false /* guest_profile */,
+        nullptr /* PrefServiceSyncable* */);

[raymes, 2016/06/29 03:50:01]

nit: same here (should just be pref_service)

[lshang, 2016/06/30 05:03:36]

We've changed to not pass in the pointer, so no need to address this.

     cookie_settings_ =
         new content_settings::CookieSettings(settings_map_.get(), &prefs_, "");
     ResetAccountConsistencyService();
   }
 
   void TearDown() override {
     account_consistency_service_->Shutdown();
     settings_map_->ShutdownOnUIThread();
     web::BrowserState::GetActiveStateManager(&browser_state_)->SetActive(false);
     PlatformTest::TearDown();
@@ skipping 292 matching lines @@
 // Tests that main domains are added to the internal map when cookies are set in
 // reaction to signin.
 TEST_F(AccountConsistencyServiceTest, SigninAddCookieOnMainDomains) {
   AddPageLoadedExpectation(kGoogleUrl, true /* continue_navigation */);
   AddPageLoadedExpectation(kYoutubeUrl, true /* continue_navigation */);
   SignIn();
 
   CheckDomainHasCookie(kGoogleDomain);
   CheckDomainHasCookie(kYoutubeDomain);
 }