GitLab

Race condition is caused by RenderProcessHost::Shutdown recreating the
sync IPC channel and asynchronously causing SyncContext::OnChannelOpened
to be called on the IO thread.

In the interim the RPH has been deleted, causing the WaitableEvent that
was passed to the SyncContext to be destroyed before it is used.

Because we never intend to use the WaitableEvent to signal shutdown in
WebView, it's simplest to just pass null for the shutdown_event,
indicating that the caller never intends to signal shutdown.

Bug: 904043,865062
Change-Id: I69a51adc78a0f1c0d6f84fbb7206fc9d58e69ed2
Reviewed-on: https://chromium-review.googlesource.com/c/1329670
Commit-Queue: Tobias Sargeant <tobiasjs@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607343}