RFR: 8278908: [macOS] Unexpected text normalization on pasting from clipboard

[Dmitry Batrak]

The fix just removes the explicit normalization of text obtained from system clipboard in JDK code, as I've found no
good justification for such a normalization, at least for the latest macOS version.
The same fix was performed in JetBrains Runtime by a user's request more than 4 years ago, and we didn't receive any
related complaints from our users ever since.

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

Commit messages:
 - fix

Changes: https://git.openjdk.java.net/jdk/pull/6866/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6866&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8278908
  Stats: 11 lines in 2 files changed: 0 ins; 9 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6866.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6866/head:pull/6866

PR: https://git.openjdk.java.net/jdk/pull/6866