[OpenJDK 2D-Dev] [9] Review Request: 8014241 Clean up unused JNI fields and methods in imageInitIDs.h

[Sergey Bylokhov]

Hello.
Please review a small cleanup for jdk9. Unused fields/methods were removed.

Bug: https://bugs.openjdk.java.net/browse/JDK-8014241
Webrev can be found at: http://cr.openjdk.java.net/~serb/8014241/webrev.01

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Best regards, Sergey.