RFR: JDK-8255032: Conflict between recent pushes breaks the build

[Jonathan Gibbons]

The patch resolves a bad merge between two recent changes.

The `DocletEnvironment docEnv` parameter no longer needs to be passed around.

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Commit messages:
 - Remove obsolete parameter

Changes: https://git.openjdk.java.net/jdk/pull/752/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=752&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8255032
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/752.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/752/head:pull/752

PR: https://git.openjdk.java.net/jdk/pull/752