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The ChromeVox, Select-to-speak, and Switch Access manifests are
generated in the shared accessibility/ directory. This change moves the
autoclick manifest to behave in the same manner.

AX-Relnotes: n/a.
Bug: 978200
Change-Id: I2470b505cf379ed512be32e52a432941d4009564
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2209304
Commit-Queue: Anastasia Helfinstein <anastasi@google.com>
Reviewed-by: Katie Dektar <katie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770674}