The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/537181f43f30baf668b1fd2a52893b789ada2198

commit 537181f43f30baf668b1fd2a52893b789ada2198
Author: rtoy <rtoy@chromium.org>
Date: Thu Feb 02 21:30:11 2017

Convert ChannelSplitter test to testharness

Update test to use testharness and new Audit.  This was updated
manually, and slightly refactored into two separate tests.

BUG= 688011 
TEST=audiochannelsplitter.html

Review-Url: https://codereview.chromium.org/2676683002
Cr-Commit-Position: refs/heads/master@{#447848}

[delete] https://crrev.com/a21f7225d107eb402268782a30f32ee3813feed5/third_party/WebKit/LayoutTests/webaudio/ChannelSplitter/audiochannelsplitter-expected.txt
[modify] https://crrev.com/537181f43f30baf668b1fd2a52893b789ada2198/third_party/WebKit/LayoutTests/webaudio/ChannelSplitter/audiochannelsplitter.html