Delay destructing ChildDiscardableSharedMemoryManager

content/child/child_thread_impl.cc

Index: content/child/child_thread_impl.cc
diff --git a/content/child/child_thread_impl.cc b/content/child/child_thread_impl.cc
index 4eb0972de6ecf3132879fb177ebe798ac162d02b..5378463a0cdade74433293961bfc4ece5b7aea4b 100644
--- a/content/child/child_thread_impl.cc
+++ b/content/child/child_thread_impl.cc
@@ -518,8 +518,9 @@ void ChildThreadImpl::Shutdown() {
   file_system_dispatcher_.reset();
   quota_dispatcher_.reset();
   WebFileSystemImpl::DeleteThreadSpecificInstance();
-  // ChildDiscardableSharedMemoryManager has to be destroyed while
-  // |thread_safe_sender_| and |message_loop_| are still valid.
+}
+
+void ChildThreadImpl::ShutdownDiscardableSharedMemoryManager() {
   discardable_shared_memory_manager_.reset();
 }