RFR: 8264138: Replace uses of Class.newInstance [v3]

[Ajit Ghaisas]

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

Ajit Ghaisas has updated the pull request incrementally with one additional commit since the last revision:

  fix review comments

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Changes:
  - all: https://git.openjdk.java.net/jfx/pull/491/files
  - new: https://git.openjdk.java.net/jfx/pull/491/files/d47ce2d5..ff6fd21e

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jfx&pr=491&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jfx&pr=491&range=01-02

  Stats: 9 lines in 2 files changed: 2 ins; 5 del; 2 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