[JDK-8387298](https://bugs.openjdk.org/browse/JDK-8387298) removed the IS_WINXP macro, and the updated code in ComCtl32Util::UnsubclassHWND and ComCtl32Util::DefWindowProc doesn't use the _DefWindowProc parameter any more.
Thus, the _DefWindowProc parameter can be removed from these functions. Removing these parameters requires updating all the usages of the functions, for example, in awt_Component.cpp, awt_Choice.cpp... --------- - [x] I confirm that I make this contribution in accordance with the [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai). ------------- Commit messages: - JDK-8387670 Changes: https://git.openjdk.org/jdk/pull/31814/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=31814&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8387670 Stats: 29 lines in 7 files changed: 0 ins; 13 del; 16 mod Patch: https://git.openjdk.org/jdk/pull/31814.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/31814/head:pull/31814 PR: https://git.openjdk.org/jdk/pull/31814
