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With this change, non-WPT layout tests are completely independent of
WPT files and hence won't be affected by imports. The change also makes
the behaviour more consistent as we already have copies of
testharness.js, testdriver.js and idlharness.js, with webidl2.js being
the only left. An apache alias rule is changed accordingly.

See crbug.com/685854 for maintaining these Chromium copies.

Besides, WebIDLParser.js (which is an old version of webidl2.js) is
removed from resources/ to avoid confusion. The only three files using
it are modified to use webidl2.js instead.

Bug: 787829, 685854
Change-Id: I2d9966646cc7db557d87ec403cd0c833ee262279
Reviewed-on: https://chromium-review.googlesource.com/785992
Commit-Queue: Robert Ma <robertma@chromium.org>
Reviewed-by: Quinten Yearsley <qyearsley@chromium.org>
Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519834}