RFR: 8314261: Make fields final in sun.net.www [v2]

[Andrey Turbanov]

> A few classes in `sun.net.www` package have non-final fields which could easily be marked `final`.

Andrey Turbanov has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Merge remote-tracking branch 'origin/master' into final_fields_sun.net.www
 - [PATCH] Make fields final in sun.net.www
   
   more finals
 - [PATCH] Make fields final in sun.net.www

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/14977/files
  - new: https://git.openjdk.org/jdk/pull/14977/files/79c8452c..91eba7be

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14977&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14977&range=00-01

  Stats: 47356 lines in 1325 files changed: 21260 ins; 17780 del; 8316 mod
  Patch: https://git.openjdk.org/jdk/pull/14977.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14977/head:pull/14977

PR: https://git.openjdk.org/jdk/pull/14977