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Preparation for issue 874059 in which the DevToolsProtocolTest harness
is needed for verifying font selection, after discussion in
https://chromium-review.googlesource.com/c/chromium/src/+/1174540

Address banned and deprecated function warnings in the process: Using a
OnceClosure for closing the specific RunLoop to replace QuitCurrent()
and remove usage of RunMessageLoop(), mark NotificationMatcher as
RepeatingCallback.

Bug: 874059
Change-Id: Id63a73e4ca7d2cb3bef888eac91bb3cc7cf8fb1a
Reviewed-on: https://chromium-review.googlesource.com/1183239Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Commit-Queue: Dominik Röttsches <drott@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585060}