Hopefully fix chrome_frame_net_tests.

In r72682, I removed this line since I assumed it was including the test utils
in the same file, not the unit tests. Put the unit tests themselves back.

BUG=68682
TEST=compiles + chrome_frame_net_tests starts running again.

Review URL: http://codereview.chromium.org/6350018

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@72734 0039d316-1c4b-4281-b951-d872f2087c98

chrome_frame/chrome_frame.gyp

@@ -484,6 +484,7 @@
         'npchrome_frame',
       ],
       'sources': [
+        '../net/url_request/url_request_unittest.cc',
         'test/chrome_frame_test_utils.cc',
         'test/chrome_frame_test_utils.h',
         'test/simulate_input.cc',