Removing some unused members from SessionConfig

I noticed these while working on the AV1 encoder. Splitting out into
a separate CL since it's not related to that work.

Bug: NO_BUG
Change-Id: I88045bd071b5cbb7943149a34ba9b5109fd12ba9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3642837
Reviewed-by: Lambros Lambrou <lambroslambrou@chromium.org>
Auto-Submit: Joe Downing <joedow@chromium.org>
Commit-Queue: Lambros Lambrou <lambroslambrou@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1002325}

remoting/protocol/session_config.h

@@ -190,9 +190,6 @@ class CandidateSessionConfig {
   std::list<ChannelConfig> event_configs_;
   std::list<ChannelConfig> video_configs_;
   std::list<ChannelConfig> audio_configs_;
-
-  bool vp9_experiment_enabled_ = false;
-  bool h264_experiment_enabled_ = false;
 };
 
 }  // namespace protocol