GitLab

Reduce dependencies on Translate internals
- Refactored some constants out into their own targets
- Stopped using LanguageDetectionDetails where simple alternatives exist
- Use url.SchemeIs()
- Use executeJavaScript:error: from ChromeEarlGreyAppInterface
- TranslateAppInterface setUp needs to be passed switch for HttpServer

Bug: 987646
Change-Id: I4c47b9abca4a64d09a267b526dadc87cb10fe76b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1979768
Commit-Queue: Peter Lee <pkl@chromium.org>
Auto-Submit: Peter Lee <pkl@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727310}