[jfx11u] Integrated: 8271230: Remove obsolete test classes and data files from 3DViewer sample

[Kevin Rushforth]

Clean backport to remove obsolete 3DViewer tests.

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Commit messages:
 - 8271230: Remove obsolete test classes and data files from 3DViewer sample

Changes: https://git.openjdk.java.net/jfx11u/pull/37/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx11u&pr=37&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8271230
  Stats: 7167 lines in 16 files changed: 0 ins; 7167 del; 0 mod
  Patch: https://git.openjdk.java.net/jfx11u/pull/37.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx11u pull/37/head:pull/37

PR: https://git.openjdk.java.net/jfx11u/pull/37