Due to the revert of eclipse-platform/eclipse.platform.swt/pull/553, the
utilities added in #933 became obsolete. The utilities are code
duplications from the SWT repository, which are faulty and have already
been updated in the SWT repository.

This change thus reverts the addition of the duplicated and now
unnecessary utilities. It reverts commit
4194b8f9cdab9e8cf8ae95b74dc7e2d5048446a9 from PR #933 for issue #910.