message_pump_libevent refactor:
* Unify WatchSocket & WatchFileHandle.
* Better encapsulate libevent.
* Fix a bug with blocking writes in ipc_posix.cc

Review URL: http://codereview.chromium.org/13757

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@7010 0039d316-1c4b-4281-b951-d872f2087c98
10 files changed