sync: remove GetAuthenticatedUsername from ProfileSyncService/SyncBackendHost.

chrome/browser/sync/profile_sync_service_mock.cc

 // Copyright (c) 2011 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/prefs/pref_service_mock_builder.h"
+#include "chrome/browser/prefs/testing_pref_store.h"
 #include "chrome/browser/sync/profile_sync_service_mock.h"
 #include "chrome/browser/sync/signin_manager.h"
 #include "chrome/browser/ui/webui/chrome_url_data_manager.h"
+#include "chrome/common/pref_names.h"
 #include "chrome/common/url_constants.h"
+#include "chrome/test/base/testing_profile.h"
 
 ProfileSyncServiceMock::ProfileSyncServiceMock()
     : ProfileSyncService(NULL, NULL, new SigninManager(), "") {
 }
 
+ProfileSyncServiceMock::ProfileSyncServiceMock(
+    Profile* profile) : ProfileSyncService(NULL, profile, NULL, "") {
+}
+
 ProfileSyncServiceMock::~ProfileSyncServiceMock() {
 }
+
+// static
+Profile* ProfileSyncServiceMock::MakeSignedInTestingProfile() {
+  TestingProfile* profile = new TestingProfile();
+  TestingPrefStore* user_prefs = new TestingPrefStore();
+  PrefService* prefs = PrefServiceMockBuilder()
+      .WithUserPrefs(user_prefs)
+      .Create();
+  profile->SetPrefService(prefs);
+  SigninManager::RegisterUserPrefs(prefs);
+  user_prefs->SetString(prefs::kGoogleServicesUsername, "foo");
+  return profile;
+}