There is a bug in the mac kernel, which can cause a file descriptor to be closed
when sent multiple times between processes. By delaying the close on the sender side by
a few second, we can eliminate this problem.

BUG=279443, 298276

Review URL: https://codereview.chromium.org/24365008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226555 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226555