Merged revision(s) 1583476 from lucene/dev/trunk:
LUCENE-5560: Replace com.google.common.base.Charsets by Java7 StandardCharsets

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1583477 13f79535-47bb-0310-9956-ffa450edef68