hg: jdk9/client/jdk: 8140314: Verify IIOMetadataFormat class on loading

[philip.race at oracle.com]

Changeset: 987d0d79ebe4
Author:    prr
Date:      2016-07-22 15:57 -0700
URL:       http://hg.openjdk.java.net/jdk9/client/jdk/rev/987d0d79ebe4

8140314: Verify IIOMetadataFormat class on loading
Reviewed-by: bpb

! src/java.desktop/share/classes/javax/imageio/metadata/IIOMetadata.java
! src/java.desktop/share/classes/javax/imageio/spi/ImageReaderWriterSpi.java
! test/javax/imageio/plugins/external_plugin_tests/TestClassPathPlugin.sh