Fix lingering thinko    File "webkit/tools/layout_tests/layout_package/test_shell_thread.py", line 155, in run     ["--time-out-ms=" + self._test_info.timeout, self._test_info.uri])   TypeError: cannot concatenate 'str' and 'int' objects introduced in http://codereview.chromium.org/67198 and affecting the valgrind layout_tests buildbot.
Fix lingering thinko 
  File "webkit/tools/layout_tests/layout_package/test_shell_thread.py", line 155, in run
    ["--time-out-ms=" + self._test_info.timeout, self._test_info.uri])
  TypeError: cannot concatenate 'str' and 'int' objects
introduced in http://codereview.chromium.org/67198
and affecting the valgrind layout_tests buildbot.

Review URL: http://codereview.chromium.org/149638

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@20832 0039d316-1c4b-4281-b951-d872f2087c98

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