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DirectSocketsServiceImpl is now a WebContentsObserver.

OpenTcpSocket() and OpenUdpSocket() now fail safely if they are called
after the RenderFrameHost is destroyed.


Bug: 1122917
Change-Id: I4a880c9aee73271cd5895818e0da3d85e32a8e5b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2383531
Auto-Submit: Eric Willigers <ericwilligers@chromium.org>
Commit-Queue: Glen Robertson <glenrob@chromium.org>
Reviewed-by: Glen Robertson <glenrob@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803005}