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Add socket_api_unittest.cc, which calls Socket API functions directly.
This skips the whole browser_tests setup that is relatively slow and
expensive. The current test merely validates the socket-type argument
handling, but the next phase will simulate blocking socket operations.

BUG=112902
TEST=see above


Review URL: https://chromiumcodereview.appspot.com/10795052

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@148856 0039d316-1c4b-4281-b951-d872f2087c98