RFR: 8378057: CAccessibility roleKey and AWTAccessor.AccessibleBundleAccessor are Redundant [v2]

[Jeremy Wood]

> This PR proposes replacing the native `roleKey` method with the `AWTAccessor.AccessibleBundleAccessor`. They appear to do the same thing.
> 
> I ran all the existing jtreg tests in the javax/accessibility folder and observed no new regressions (tested on Mac).

Jeremy Wood has updated the pull request incrementally with one additional commit since the last revision:

  8378057: changing null check
  
  This is in response to:
  https://github.com/openjdk/jdk/pull/29868#discussion_r2844805891

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Changes:
  - all: https://git.openjdk.org/jdk/pull/29868/files
  - new: https://git.openjdk.org/jdk/pull/29868/files/8c74bfcf..0f01ea62

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29868&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29868&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/29868.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29868/head:pull/29868

PR: https://git.openjdk.org/jdk/pull/29868