GitLab

This change is a simple cleanup: It removes some Channel API
that is only used only in POSIX specific tests. These
funtions still live in ChannelPosix. POSIX speicific tests
now touch ChannelPosix instead of its superclass Channel.

TEST=none
R=darin@chromium.org, jam@chromium.org
BUG=377980

Review URL: https://codereview.chromium.org/320433002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@275632 0039d316-1c4b-4281-b951-d872f2087c98