Revert of [Chromecast] Use base::FeatureList to control features.

chromecast/base/cast_features.h

-// Copyright 2017 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 CHROMECAST_BASE_CAST_FEATURES_H_
-#define CHROMECAST_BASE_CAST_FEATURES_H_
-
-#include <cstdint>
-#include <memory>
-#include <string>
-#include <unordered_set>
-
-#include "base/feature_list.h"
-#include "base/macros.h"
-
-namespace base {
-class DictionaryValue;
-class ListValue;
-}
-
-namespace chromecast {
-
-// Initialize the global base::FeatureList instance, taking into account
-// overrides from DCS and the command line. |dcs_features| and
-// |dcs_experiment_ids| are read from the PrefService in the browser process.
-// |cmd_line_enable_features| and |cmd_line_disable_features| should be passed
-// to this function, unmodified from the command line.
-//
-// This function should be called before the browser's main loop. After this is
-// called, the other functions in this file may be called on any thread.
-void InitializeFeatureList(const base::DictionaryValue& dcs_features,
-                           const base::ListValue& dcs_experiment_ids,
-                           const std::string& cmd_line_enable_features,
-                           const std::string& cmd_line_disable_features);
-
-// Given a dictionary of features, create a copy that is ready to be persisted
-// to disk. Encodes all values as strings,  which is how the FieldTrial
-// classes expect the param data.
-base::DictionaryValue GetOverriddenFeaturesForStorage(
-    const base::DictionaryValue& features);
-
-// Query the set of experiment ids set for this run. Intended only for metrics
-// reporting. Must be called after InitializeFeatureList(). May be called on any
-// thread.
-const std::unordered_set<int32_t>& GetDCSExperimentIds();
-
-// Reset static state to ensure clean unittests. For tests only.
-void ResetCastFeaturesForTesting();
-
-}  // namespace chromecast
-
-#endif  // CHROMECAST_BASE_CAST_FEATURES_H_