Replacements of more immutable collections. One thing I found was that the field `idMap` in `com.sun.java.scene.web.WebViewHelper.WebView` seems unused. I can remove it if that's indeed the case.
------------- Commit messages: - Fix a previous change - More leftovers - Unified style - Fix mistake from previous commit - Replace map in JSCL - Initial commit of 2 files Changes: https://git.openjdk.java.net/jfx/pull/627/files Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=627&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8272808 Stats: 162 lines in 7 files changed: 0 ins; 28 del; 134 mod Patch: https://git.openjdk.java.net/jfx/pull/627.diff Fetch: git fetch https://git.openjdk.java.net/jfx pull/627/head:pull/627 PR: https://git.openjdk.java.net/jfx/pull/627
