Neuter RefCountedBase::CalledOnValidSequence

This removes a dependency on sequence_checker.cc and sequence_checker_impl.cc.
---
 base/memory/ref_counted.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/base/memory/ref_counted.cc b/base/memory/ref_counted.cc
index 62fafbc45221..76b1e91e5d1c 100644
--- a/base/memory/ref_counted.cc
+++ b/base/memory/ref_counted.cc
@@ -82,8 +82,12 @@ void RefCountedThreadSafeBase::AddRefWithCheck() const {
 
 #if DCHECK_IS_ON()
 bool RefCountedBase::CalledOnValidSequence() const {
+#if defined(MOZ_ZUCCHINI)
+  return true;
+#else
   return sequence_checker_.CalledOnValidSequence() ||
          g_cross_thread_ref_count_access_allow_count.load() != 0;
+#endif  // defined(MOZ_ZUCCHINI)
 }
 #endif
 
-- 
2.42.0.windows.2