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The WebAudio spec says we must throw errors for a negative
rolloffFactor and for a coneOuterGain outside the interval [0,
1]. Make it so.

Also add some additional tests to ctor-panner.html to verify that a
rolloffFactor of 0 or 100 do not throw errors and that a
coneOuterGain of 0 or 1 do not throw errors.

Remove invalid tests from panner-rolloff-clamping.html because
negative rolloffFactor now throws an error.

Finally remove text expectation for ctor-panner.html test, which
passes now.

Bug: 879845
Test: the-pannernode-interface/ctor-panner.html, the-pannernode-interface/panner-rolloff-clamping.html
Change-Id: Ie90e9fe13e82fd3cc955060dc9e77266ef4ff591
Reviewed-on: https://chromium-review.googlesource.com/1205099
Commit-Queue: Raymond Toy <rtoy@chromium.org>
Reviewed-by: Hongchan Choi <hongchan@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589045}