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We are no longer passing the API key to the frontend to perform the
survey so this CL deletes getAPIKey which is not used.

The devtools frontend now triggers the existing Chrome HaTS impl to run
the survey.

CanShowSurvey will be used to determine whether we show the survey link
in the devtools frontend, and then ShowSurvey will be used when the
link is clicked.

Bug: 1112738
Change-Id: Ia456e419c2678cfe6c90976d82af8d37f1ac435f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2509570
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823551}