RFR: 8146918: ConcurrentModificationException in MediaPlayer

[n-gabe]

There is a ConcurrentModificationException in MediaPlayer when removing a MediaView from it. The root cause is that you can't iterate over a HashSet with for (WeakReference<MediaView> vref : viewRefs) and removing items from the collection by viewRefs.remove(vref); within this loop.

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Commit messages:
 - fix indentation
 - fix ConcurrentModificationException in MediaPlayer.java

Changes: https://git.openjdk.org/jfx/pull/1377/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1377&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8146918
  Stats: 4 lines in 1 file changed: 1 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jfx/pull/1377.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1377/head:pull/1377

PR: https://git.openjdk.org/jfx/pull/1377