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: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@19975 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser