base/thread_unittest: wrap test was setting current thread to NULL.

This broke unittests following ThreadTest.Wrap

BUG=3836
R=pbos@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/28689004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@7413 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/base/base_tests.gyp b/base/base_tests.gyp
index 77bed2c..457fbdc 100644
--- a/base/base_tests.gyp
+++ b/base/base_tests.gyp
@@ -105,7 +105,7 @@
           'task_unittest.cc',
           'testclient_unittest.cc',
           'thread_checker_unittest.cc',
-          #'thread_unittest.cc',
+          'thread_unittest.cc',
           #'timeutils_unittest.cc',
           'urlencode_unittest.cc',
           #'versionparsing_unittest.cc',