Simplify code in accessibility_extension_api.cc

This is a no-op change. Specifically, it replaces all instances of
"extensions::api::accessibility_private" with "accessibility_private".

Bug: None
Change-Id: I1ecb6c725f763a815495d27f345d196a181813af
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1504959
Commit-Queue: Anastasia Helfinstein <anastasi@google.com>
Auto-Submit: Anastasia Helfinstein <anastasi@google.com>
Reviewed-by: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#639276}
1 file changed