Reorganizes Chromecast code to better reflect functional dependencies.

chromecast/metrics/cast_metrics_prefs.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 "chromecast/metrics/cast_metrics_prefs.h"
-
-#include "chromecast/metrics/cast_stability_metrics_provider.h"
-#include "components/metrics/metrics_service.h"
-
-namespace chromecast {
-namespace metrics {
-
-void RegisterPrefs(PrefRegistrySimple* registry) {
-  ::metrics::MetricsService::RegisterPrefs(registry);
-  CastStabilityMetricsProvider::RegisterPrefs(registry);
-}
-
-}  // namespace metrics
-}  // namespace chromecast