RFR: 8289390: Fix warnings: type parameter E is hiding the type E

[Andy Goryachev]

- trivial change removes 4 eclipse warnings

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Commit messages:
 - 8289390: fixed type parameter hiding another type

Changes: https://git.openjdk.org/jfx/pull/812/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=812&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8289390
  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jfx/pull/812.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/812/head:pull/812

PR: https://git.openjdk.org/jfx/pull/812