RFR: 8336412: sun.net.www.MimeTable has a few unused methods [v2]

[Volkan Yazıcı]

> Cleans up `sun.net.www.MimeTable`:
> 
> * Removes unused methods & variables
> * Removes commented out code
> * Simplifies iterations over arrays

Volkan Yazıcı has updated the pull request incrementally with one additional commit since the last revision:

  Make `MimeTable` final

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/22831/files
  - new: https://git.openjdk.org/jdk/pull/22831/files/91554c58..dbd8bab7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22831&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22831&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/22831.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22831/head:pull/22831

PR: https://git.openjdk.org/jdk/pull/22831