Hook up the SequencedWorkerPool to the browser thread.

[re-land of 116816 http://codereview.chromium.org/9065009]

This does some refactoring of the static data in the browser thread so we only have one global object instead of a bunch fo separate arrays.

It also hooks up the visited link master's I/O to use this new system as a proof of concept.
Review URL: https://chromiumcodereview.appspot.com/9124033

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@118236 0039d316-1c4b-4281-b951-d872f2087c98
10 files changed