Fix clang warning in UDPSocketTest.
Fix clang warning in UDPSocketTest.

TEST=clang is happy
BUG=None
TBR=zea@chromium.org

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@77504 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