This removes --harmony-completion, --harmony-concat-spreadable, and --harmony-tolength and moves the appropriate tests from harmony/ to es6/. Review URL: https://codereview.chromium.org/1667453002 Cr-Commit-Position: refs/heads/master@{#33712}
R=adamk@chromium.org BUG=chromium:516775 LOG=N Review URL: https://codereview.chromium.org/1270403002 Cr-Commit-Position: refs/heads/master@{#30042}