RFR: 8277817: java/awt/dnd/BadSerializationTest/BadSerializationTest.java failed: ClassNotFoundException: com.apple.laf.AquaImageFactory$SystemColorProxy [v7]

[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).

Liam Miller-Cushon has updated the pull request incrementally with one additional commit since the last revision:

  Add @since 19 to new methods

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/6603/files
  - new: https://git.openjdk.java.net/jdk/pull/6603/files/02ae7fba..10b53ea2

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=6603&range=06
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=6603&range=05-06

  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6603.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6603/head:pull/6603

PR: https://git.openjdk.java.net/jdk/pull/6603