Revert of Enable H.264 video WebRTC behind run-time flag and add WebRtcBrowserTest for H.264

content/public/common/feature_h264_with_openh264_ffmpeg.cc

Index: content/public/common/feature_h264_with_openh264_ffmpeg.cc
diff --git a/content/public/common/feature_h264_with_openh264_ffmpeg.cc b/content/public/common/feature_h264_with_openh264_ffmpeg.cc
deleted file mode 100644
index df6322bb5f5c8ccdf45e27cc3b2e0dfa983652ba..0000000000000000000000000000000000000000
--- a/content/public/common/feature_h264_with_openh264_ffmpeg.cc
+++ /dev/null
@@ -1,17 +0,0 @@
-// Copyright 2013 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 "content/public/common/feature_h264_with_openh264_ffmpeg.h"
-
-namespace content {
-
-#if BUILDFLAG(RTC_USE_H264)
-
-const base::Feature kWebRtcH264WithOpenH264FFmpeg {
-  "WebRtcH264WithOpenH264FFmpeg", base::FEATURE_DISABLED_BY_DEFAULT
-};
-
-#endif  // BUILDFLAG(RTC_USE_H264)
-
-} // namespace content