[Extensions] Do some cleanup in TabHelper. This file was incorrectly including a file in chrome/browser/extensions/api/declarative_content. While I was in the file, I also did some opportunistic cleanup. Bug: 40593486 Change-Id: I65ff8bc1b9e3dcda48fe49126b6a45e1e0c7bddc Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5935401 Auto-Submit: David Bertoni <dbertoni@chromium.org> Reviewed-by: Tim <tjudkins@chromium.org> Commit-Queue: David Bertoni <dbertoni@chromium.org> Cr-Commit-Position: refs/heads/main@{#1369092}
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