GitLab

This CL uses TranslateTabHelper instead of Profile and also cleans up
some unused code and irrelevant dependencies.

BUG=371845

Review URL: https://codereview.chromium.org/286973003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@270758 0039d316-1c4b-4281-b951-d872f2087c98