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

chromecast/browser/cast_browser_main_parts.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 CHROMECAST_BROWSER_CAST_BROWSER_MAIN_PARTS_H_
 #define CHROMECAST_BROWSER_CAST_BROWSER_MAIN_PARTS_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
-#include "base/metrics/field_trial.h"
 #include "build/buildflag.h"
 #include "chromecast/chromecast_features.h"
 #include "content/public/browser/browser_main_parts.h"
 #include "content/public/common/main_function_params.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 class Thread;
 }  // namespace base
 
@@ skipping 36 matching lines @@
   void PostMainMessageLoopStart() override;
   void ToolkitInitialized() override;
   int PreCreateThreads() override;
   void PreMainMessageLoopRun() override;
   bool MainMessageLoopRun(int* result_code) override;
   void PostMainMessageLoopRun() override;
   void PostDestroyThreads() override;
 
  private:
   std::unique_ptr<CastBrowserProcess> cast_browser_process_;
-  base::FieldTrialList field_trial_list_;
   const content::MainFunctionParams parameters_;  // For running browser tests.
   URLRequestContextFactory* const url_request_context_factory_;
   std::unique_ptr<net::NetLog> net_log_;
   std::unique_ptr<media::VideoPlaneController> video_plane_controller_;
   std::unique_ptr<media::MediaCapsImpl> media_caps_;
   std::unique_ptr<CastWindowManager> window_manager_;
 
 #if BUILDFLAG(IS_CAST_USING_CMA_BACKEND)
   // CMA thread used by AudioManager, MojoRenderer, and MediaPipelineBackend.
   std::unique_ptr<base::Thread> media_thread_;
 
   // Tracks usage of media resource by e.g. CMA pipeline, CDM.
   media::MediaResourceTracker* media_resource_tracker_;
 
   // Tracks all media pipeline backends.
   std::unique_ptr<media::MediaPipelineBackendManager>
       media_pipeline_backend_manager_;
 
   std::unique_ptr<CastMemoryPressureMonitor> memory_pressure_monitor_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(CastBrowserMainParts);
 };
 
 }  // namespace shell
 }  // namespace chromecast
 
 #endif  // CHROMECAST_BROWSER_CAST_BROWSER_MAIN_PARTS_H_