RFR: JDK-8282582: Unused methods in Utils

[Jonathan Gibbons]

Please review a simple change to remove dead/unused code from the internal `Utils` class.

-------------

Commit messages:
 - JDK-8282582: Unused methods in Utils

Changes: https://git.openjdk.java.net/jdk/pull/7670/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7670&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8282582
  Stats: 280 lines in 1 file changed: 0 ins; 280 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7670.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7670/head:pull/7670

PR: https://git.openjdk.java.net/jdk/pull/7670