[7u] Request for approval: 7184945 [macosx] NPE in AquaComboBoxUI since jdk7u6b17, jdk8b47

[Sergey Bylokhov]

Hi Everyone,
This is a direct back port from jdk 8 to jdk 7u.

Bug: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7184945
Webrev can be found at: http://cr.openjdk.java.net/~serb/7184945/webrev.00
jdk8 changeset: http://hg.openjdk.java.net/jdk8/jdk8/jdk/rev/4912a9e3a95e

Reviewers: Alexander Scherbatiy, Sergey Malenkov.

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Best regards, Sergey.