Updating UMA labels for SearchEngineType enum.

Change-Id: I44c09d48866dd89328217dd3279ef23ca6fc5214
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1598470
Auto-Submit: Filip Gorski <fgorski@chromium.org>
Reviewed-by: Brandon Wylie <wylieb@chromium.org>
Commit-Queue: Brandon Wylie <wylieb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#657327}
1 file changed