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Asynchronous source mapping makes {rawLocationToUILocation} asynchrounous.
This CL adds async/awaits to all affected test helpers and methods
in http/tests/devtools/sources/* web tests.

Note: The inline-breakpoint-with-source-map.js test is re-written using
a newer test utility that helps with flakiness.

Note 2: The live-edit-breakpoint.js web test is disabled for now, as it
requres a 3-way change. The new baseline is already committed with this
CL.

Bug: chromium:1032016
Change-Id: I77a98faff99c02c40df46b115a1da0f228282844
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2064214Reviewed-by: Mathias Bynens <mathias@chromium.org>
Commit-Queue: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743463}