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This rolls testharness.js, idlharness.js, and webidl2.js from the
external copy in external/wpt/resources/ to the internal copy in
resources/, bringing us up to WPT SHA e343467e.

Note that the webidl2.js changes are just tab characters present in the
original file that I accidentally cleaned into spaces in the previous
roll.

Bug: 1067618, 1066131
Change-Id: I1ccdf13418e10ace29564695d3dd20a738a7a3eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2135540Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Robert Ma <robertma@chromium.org>
Commit-Queue: Stephen McGruer <smcgruer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756371}