RFR: 8277817: java/awt/dnd/BadSerializationTest/BadSerializationTest.java failed: ClassNotFoundException: com.apple.laf.AquaImageFactory$SystemColorProxy

[Liam Miller-Cushon]

This change updates the serialized objects used by `java/awt/dnd/BadSerializationTest/BadSerializationTest.java` using a similar approach to the previous fix in [JDK-8039082](https://bugs.openjdk.java.net/browse/JDK-8039082).

It also contains a fix for the subset of [JDK-8278620](https://bugs.openjdk.java.net/browse/JDK-8278620) necessary for the test to pass with the updated serialized objects.

See also discussion in https://git.openjdk.java.net/jdk/pull/6603

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Commit messages:
 - 8277817: java/awt/dnd/BadSerializationTest/BadSerializationTest.java failed: ClassNotFoundException: com.apple.laf.AquaImageFactory$SystemColorProxy

Changes: https://git.openjdk.java.net/jdk/pull/7100/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7100&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8277817
  Stats: 9 lines in 8 files changed: 8 ins; 1 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7100.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7100/head:pull/7100

PR: https://git.openjdk.java.net/jdk/pull/7100