RFR: JDK-8282777: Create a Regression test for JDK-4515031 [v6]

[Srinivas Mandalika]

> Create a Regression test for [JDK-4515031](https://bugs.openjdk.java.net/browse/JDK-4515031)
> 
> The issue indicates the need for a a getAccessibleDescription being implemented for the JFileChooser.
> The test added verifies the same.
> This review is for migrating tests from a closed test suite to open.

Srinivas Mandalika has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  Review comment fixed: removed redundant robot code.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7738/files
  - new: https://git.openjdk.java.net/jdk/pull/7738/files/194e4dbc..02705d15

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7738&range=05
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7738&range=04-05

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7738.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7738/head:pull/7738

PR: https://git.openjdk.java.net/jdk/pull/7738