RFR: 8264138: Replace uses of Class.newInstance

[Ajit Ghaisas]

This PR replaces Class.newInstance() deprecated method with Contructor.newinstance().

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Commit messages:
 - remove blankline
 - replace deprecated Class.newInstance

Changes: https://git.openjdk.java.net/jfx/pull/491/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=491&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8264138
  Stats: 32 lines in 8 files changed: 0 ins; 6 del; 26 mod
  Patch: https://git.openjdk.java.net/jfx/pull/491.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/491/head:pull/491

PR: https://git.openjdk.java.net/jfx/pull/491