Integrated: JDK-8305098 [Backout] JDK-8303912 Clean up JavadocTokenizer

[Jim Laskey]

This reverts commit 1fc218c58b58887c3b217603ed222ba0b561a9f1.

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Commit messages:
 - Revert "8303912: Clean up JavadocTokenizer"

Changes: https://git.openjdk.org/jdk/pull/13212/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13212&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8305098
  Stats: 389 lines in 4 files changed: 163 ins; 140 del; 86 mod
  Patch: https://git.openjdk.org/jdk/pull/13212.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13212/head:pull/13212

PR: https://git.openjdk.org/jdk/pull/13212