Refactoring in client_socket_pool_base_unittest.cc.
Refactoring in client_socket_pool_base_unittest.cc.

This is a preparation to add tests for limiting total number of sockets.

TEST=Covered by net_unittests.

http://crbug.com/15093

Review URL: http://codereview.chromium.org/149159

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@19975 0039d316-1c4b-4281-b951-d872f2087c98

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