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The last time we updated this was before the GYP -> GN switch.
This change adds a build rule for the caret browsing extension.

Also fixes description of keyboard shortcut for Caret Browsing on
Chrome OS. The right way to generate F7 is Search+IncreaseBrightness now,
not Alt.

Bug: none
Change-Id: I70b645ce65e2f5e8310cec6ce02e3083b9f6e2df
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1850197Reviewed-by: David Tseng <dtseng@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708355}