RFR: 8268222: javax/xml/jaxp/unittest/transform/Bug6216226Test.java failed, cannot delete file

[Joe Wang]

Revert changes in StreamResult.java made through https://github.com/openjdk/jdk/pull/4318 since it was creating a file stream on behalf of the Transformer, which resulted in a leaking file handle because the Transformer would only close files it opened.

This change instead replace the problematic file-uri-url-file conversion code with nio Paths. While we generally don't make such changes if it's not necessary as Apache still supports older versions of the JDK, we are okay with a code level 8.

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Commit messages:
 - 8268222: javax/xml/jaxp/unittest/transform/Bug6216226Test.java failed, cannot delete file

Changes: https://git.openjdk.java.net/jdk/pull/4353/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4353&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268222
  Stats: 37 lines in 2 files changed: 2 ins; 24 del; 11 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4353.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4353/head:pull/4353

PR: https://git.openjdk.java.net/jdk/pull/4353