RFR: 8275819: [TableRowAccessibility accessibilityChildren] method is ineffective

[Anton Tarasov]

Retrieve only cells for a particular table row when requested, not the whole table.

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Commit messages:
 - 8275819: [TableRowAccessibility accessibilityChildren] method is ineffective

Changes: https://git.openjdk.java.net/jdk/pull/6085/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6085&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8275819
  Stats: 101 lines in 2 files changed: 71 ins; 13 del; 17 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6085.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6085/head:pull/6085

PR: https://git.openjdk.java.net/jdk/pull/6085