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Changed some API names. Wrapped existing UDPClientSocket. Added one unit test for controller. The socket API itself isn't tested for two reasons: (1) this is an interim checkin, where Part 2 will add UDP receiving, and that will likely involve some API changes, so I didn't bother constructing a whole extension built on a temporary API; and (2) the wrapper itself is so thin around the existing UDPClientSocket API that a unit test of the wrapper wouldn't accomplish much.

BUG=none
TEST=see above.


Review URL: http://codereview.chromium.org/8743017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@113069 0039d316-1c4b-4281-b951-d872f2087c98