RFR: 8331591: sun.font.CharSequenceCodePointIterator is buggy and unused [v2]

[Phil Race]

> Delete an internal class that has been around for 20 years but never been used.
> Verified that is true at least as far back as JDK7
> All platforms build. Tests pass.

Phil Race has updated the pull request incrementally with one additional commit since the last revision:

  8331591

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Changes:
  - all: https://git.openjdk.org/jdk/pull/19072/files
  - new: https://git.openjdk.org/jdk/pull/19072/files/f22d16f2..1ec19bd7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19072&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19072&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/19072.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19072/head:pull/19072

PR: https://git.openjdk.org/jdk/pull/19072