This reverts commit a7f0e62938b723556a529e5cba05e5ada0e6aa2b.
The //lib/js:highlightjs in
//polygerrit-ui:polygerrit_components.bower_components appeared to be
unused because the library is specially inserted into the PG app bundle
in polygerrit-ui/app/rules.bzl. However, it was used by development
servers such as the WAR using --polygerrit-dev or by the run-server.sh
proxy.
Bug: Issue 8777
Change-Id: Ie1467ed9bc9f7e011c870629ba1c9390fa0c9559