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The Web Audio tests (in /webaudio) have idlharness test on an
interface-by-interface basis, but the new hotness is to have the
IDL fragments consolidated. This also allows dependent specs to
include the master interface definitions.

Bug: 679813,697123,785409,823431

Change-Id: I60bc8415627b8b3f43c13060e4bf65f47bc17c2b
Reviewed-on: https://chromium-review.googlesource.com/965401
Commit-Queue: Joshua Bell <jsbell@chromium.org>
Reviewed-by: Raymond Toy <rtoy@chromium.org>
Reviewed-by: Hongchan Choi <hongchan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544173}