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

chrome/browser/signin/fake_account_tracker_service.h

+// 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.
+
+#ifndef CHROME_BROWSER_SIGNIN_FAKE_ACCOUNT_TRACKER_SERVICE_H_
+#define CHROME_BROWSER_SIGNIN_FAKE_ACCOUNT_TRACKER_SERVICE_H_
+
+#include "components/signin/core/browser/account_tracker_service.h"
+
+class KeyedService;
+
+namespace content {
+class BrowserContext;
+}
+
+// AccountTrackerService is a KeyedService that retrieves and caches GAIA
+// information about Google Accounts.  This fake class can be used in tests
+// to prevent AccountTrackerService from sending network requests.
+class FakeAccountTrackerService : public AccountTrackerService {
+ public:
+  static KeyedService* Build(content::BrowserContext* context);
+
+ private:
+  FakeAccountTrackerService();
+  virtual ~FakeAccountTrackerService();
+
+  virtual void StartFetchingUserInfo(const std::string& account_id) OVERRIDE;
+
+  DISALLOW_COPY_AND_ASSIGN(FakeAccountTrackerService);
+};
+
+#endif  // CHROME_BROWSER_SIGNIN_FAKE_ACCOUNT_TRACKER_SERVICE_H_