Switch to a simple linked-list for worker thread pool

The goal was to avoid alloc/free during the thread
teardown callback, and this CL provides a very simple
and clear implementation.

r=rtenneti
BUG=104696
Review URL: http://codereview.chromium.org/8597017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@110856 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed