Remove test-geckolib, run test-stylo on travis

.travis.yml

@@ -15,7 +15,7 @@ matrix:
          - ./mach test-compiletest
          - ./mach test-unit
          - ./mach build-geckolib
-         - ./mach test-geckolib
+         - ./mach test-stylo
          - bash etc/ci/check_no_unwrap.sh
          - bash etc/ci/lockfile_changed.sh
          - bash etc/ci/manifest_changed.sh

python/servo/testing_commands.py

@@ -158,17 +158,6 @@ class MachCommands(CommandBase):
                     return suite
         return None
 
-    @Command('test-geckolib',
-             description='Test geckolib sanity checks',
-             category='testing')
-    def test_geckolib(self):
-        self.ensure_bootstrapped()
-
-        env = self.build_env()
-        env["RUST_BACKTRACE"] = "1"
-
-        return call(["cargo", "test"], env=env, cwd=path.join("ports", "geckolib"))
-
     @Command('test-perf',
              description='Run the page load performance test',
              category='testing')