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This extension will be used by any ash accessibility feature
which wants some information about the accessibility tree.

This is a pure rename with no functional changes.

AX-Relnotes: n/a
Bug: 960373
Change-Id: I2ca9db321fce6c44dfb374ca3c690986591acd96
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2252037Reviewed-by: Ben Wells <benwells@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: Katie Dektar <katie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780890}