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Now we only use valid UTF8 strings. Also, the session_id string must
begin with "{", end with "}", and be nonempty, according to DCHECKs in
MakeProtocolRequest.

Bug: 1014625
Change-Id: If30c9b21f63c7cab7a01f456ec0593971ef1bc37
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1863669Reviewed-by: Sorin Jianu <sorin@chromium.org>
Commit-Queue: Dan McArdle <dmcardle@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706109}