Remove missing .js file from unit test.

This was causing remoting_unittests to fail in Release builds.

BUG=297970
TBR=rmsousa@chromium.org

Review URL: https://codereview.chromium.org/24620002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@225201 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 225201