chrome_frame: Run vectored_handler_tests unit tests through base test suite.

Using gtest.gyp:gtest_main is very uncommon in chromium tree, there
are only two instances. By running it through base:run_all_unittests
should be more robust. Previous CL was
https://codereview.chromium.org/110983002

BUG=None
TEST=vectored_handler_tests
R=ananta@chromium.org,grt@chromium.org

Review URL: https://codereview.chromium.org/103453006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240188 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 240188