Enable the unit tests in src/extensions/ dir

BUG=162530
TBR=ben@chromium.org

Review URL: https://chromiumcodereview.appspot.com/12088096

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@180070 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed