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An earlier change (commit aa9f4c85)
added the new ax::mojom::StringAttribute inputType.  This test-only
change updates AX browser tests to dump the value of this attribute
where applicable.

Change-Id: I9411b9dc779beacfa03c6c79b0f1a3644be0a9a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1733112
Commit-Queue: Kevin Babbitt <kbabbitt@microsoft.com>
Reviewed-by: Kevin Babbitt <kbabbitt@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#683791}