servo: Merge #10495 - Removed etc/ci/check_no_unwrap.sh from .travis.yml (from asajeffrey:temporarily-disable-unwrap-test); r=KiChjang

Temporarily disable #10448 until all the uses of unwrap are removed from the constellation/compositor.

Source-Repo: https://github.com/servo/servo
Source-Revision: 90ab488d424511e81902b58056602e2b498866ec

servo/.travis.yml

@@ -16,7 +16,6 @@ matrix:
          - ./mach test-compiletest
          - bash etc/ci/lockfile_changed.sh
          - bash etc/ci/manifest_changed.sh
-         - bash etc/ci/check_no_unwrap.sh
       cache:
         directories:
           - .cargo