message: Remove deprecated ExpectationToString in SequenceChecker
  Cr-Commit-Position: refs/heads/master@{#33157}
diff: @@ -46,10 +46,6 @@ class RTC_LOCKABLE SequenceChecker
  : public webrtc_sequence_checker_internal::SequenceCheckerDoNothing {};
  #endif // RTC_ENABLE_THREAD_CHECKER
  -namespace webrtc_seq_check_impl {
  -// TODO(titovartem): Remove when downstream deps are updated
  -using ::webrtc::webrtc_sequence_checker_internal::SequenceCheckerScope;
  -} // namespace webrtc_seq_check_impl
  } // namespace webrtc
  // RTC_RUN_ON/RTC_GUARDED_BY/RTC_DCHECK_RUN_ON macros allows to annotate
  @@ -117,16 +113,6 @@ using ::webrtc::webrtc_sequence_checker_internal::SequenceCheckerScope;
  #define RTC_RUN_ON(x) \
  RTC_THREAD_ANNOTATION_ATTRIBUTE__(exclusive_locks_required(x))
  -namespace webrtc {
  -
  -// Deprecated. Do not use.
  -template <typename ThreadLikeObject>
  -RTC_DEPRECATED std::string ExpectationToString(const ThreadLikeObject* o) {
  - return webrtc::webrtc_sequence_checker_internal::ExpectationToString(o);
  -}
  -
  -} // namespace webrtc
  -
  #define RTC_DCHECK_RUN_ON(x) \
  webrtc::webrtc_sequence_checker_internal::SequenceCheckerScope scope(x); \
  RTC_DCHECK((x)->IsCurrent()) \
  