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Ignoring the result of WaitUntilConditionOrTimeout call is incorrect in
many cases. So WaitUntilConditionOrTimeout will have WARN_UNUSED_RESULT
annotation to force callers to do the checks. This CL prepares ios/web
for WaitUntilConditionOrTimeout changes.

Bug: 780062
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Ide53b4613df407149c43cdfa68751be171db313f
Reviewed-on: https://chromium-review.googlesource.com/746995Reviewed-by: Mike Baxley <baxley@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#513240}