Make sure avatar menu does not use account_id for display purposes.

chrome/browser/signin/fake_account_tracker_service.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 "chrome/browser/signin/fake_account_tracker_service.h"
+
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/signin/profile_oauth2_token_service_factory.h"
+#include "components/signin/core/browser/profile_oauth2_token_service.h"
+
+// static
+KeyedService* FakeAccountTrackerService::Build(
+    content::BrowserContext* context) {
+  Profile* profile = Profile::FromBrowserContext(context);
+  FakeAccountTrackerService* service = new FakeAccountTrackerService();
+  service->Initialize(
+      ProfileOAuth2TokenServiceFactory::GetForProfile(profile),
+      profile->GetPrefs(),
+      profile->GetRequestContext());
+  return service;
+}
+
+FakeAccountTrackerService::FakeAccountTrackerService() {}
+
+FakeAccountTrackerService::~FakeAccountTrackerService() {}
+
+void FakeAccountTrackerService::StartFetchingUserInfo(
+    const std::string& account_id) {
+  // In tests, don't do actual network fetch.
+}