Integrated: 8277407: javax/swing/plaf/synth/SynthButtonUI/6276188/bug6276188.java fails to compile after JDK-8276058

[Prasanta Sadhukhan]

Fixed compilation issue.

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Commit messages:
 - 8277407: javax/swing/plaf/synth/SynthButtonUI/6276188/bug6276188.java fails to compile after JDK-8276058

Changes: https://git.openjdk.java.net/jdk/pull/6458/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6458&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8277407
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6458.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6458/head:pull/6458

PR: https://git.openjdk.java.net/jdk/pull/6458