The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/efb11f5a890fd4a793dbf8383fb8b529ddf39898

commit efb11f5a890fd4a793dbf8383fb8b529ddf39898
Author: rtoy <rtoy@chromium.org>
Date: Tue Oct 18 17:47:18 2016

ChannelSplitterNode channelCount and mode are constant.

The channelCount for a ChannelSplitterNode is now set to the number of
outputs and cannot be changed.  The channelCountMode is also fixed to
"explicit".

Intent: https://groups.google.com/a/chromium.org/d/msg/blink-dev/wavuM3cciPc/1Df3Hrr-CAAJ
Feature: https://www.chromestatus.com/feature/4701085050601472

BUG= 653234 
TEST=constructor/channelsplitter.html updated

Review-Url: https://codereview.chromium.org/2394953002
Cr-Commit-Position: refs/heads/master@{#426006}

[modify] https://crrev.com/efb11f5a890fd4a793dbf8383fb8b529ddf39898/third_party/WebKit/LayoutTests/webaudio/constructor/channelsplitter.html
[modify] https://crrev.com/efb11f5a890fd4a793dbf8383fb8b529ddf39898/third_party/WebKit/Source/modules/webaudio/ChannelSplitterNode.cpp
[modify] https://crrev.com/efb11f5a890fd4a793dbf8383fb8b529ddf39898/third_party/WebKit/Source/modules/webaudio/ChannelSplitterNode.h