Revert of Create and integrate a metrics service client into Blimp engine.

blimp/engine/app/blimp_metrics_service_client.h

-// Copyright 2016 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 BLIMP_ENGINE_APP_BLIMP_METRICS_SERVICE_CLIENT_H_
-#define BLIMP_ENGINE_APP_BLIMP_METRICS_SERVICE_CLIENT_H_
-
-#include <stdint.h>
-
-#include <string>
-
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-
-class PrefService;
-
-namespace net {
-class URLRequestContextGetter;
-}  // namespace net
-
-namespace blimp {
-namespace engine {
-
-// Initializes metrics reporting for Blimp including initializing metrics
-// providers and reporting state.
-void InitializeBlimpMetrics(
-    std::unique_ptr<PrefService> pref_service,
-    scoped_refptr<net::URLRequestContextGetter> request_context_getter);
-
-// Graceful and expected metrics reporting shutdown for Blimp.
-void FinalizeBlimpMetrics();
-
-}  // namespace engine
-}  // namespace blimp
-
-#endif  // BLIMP_ENGINE_APP_BLIMP_METRICS_SERVICE_CLIENT_H_