BindProcessNode to take a render process host id

It's dangerous to post a task with a RenderProcessHost pointer because
the RenderProcessHost can go away before the task is run.

Bug: 863341
Change-Id: I9a5e3ae068dd42ea5a68d6e4afcf77d7486eeac4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1581580
Auto-Submit: Alex Clarke <alexclarke@chromium.org>
Commit-Queue: Sigurður Ásgeirsson <siggi@chromium.org>
Reviewed-by: Sigurður Ásgeirsson <siggi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#653553}
1 file changed