RFR: JDK-8354532 : Open source JFileChooser Tests - Set 7

[Harshitha Onkar]

Following tests are open sourced -

1. javax/swing/JFileChooser/bug4357012.java
2. javax/swing/JFileChooser/bug4926884.java
3. javax/swing/JFileChooser/bug5045464.java
4. javax/swing/JFileChooser/bug6515169.java

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Commit messages:
 - test update
 - JFileChooser Tests

Changes: https://git.openjdk.org/jdk/pull/24743/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24743&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8354532
  Stats: 387 lines in 4 files changed: 387 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/24743.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24743/head:pull/24743

PR: https://git.openjdk.org/jdk/pull/24743