Move TranslateManager::IsTranslatableURL to be a client-level concept.
The concept of whether a given URL is translatable is an embedder-level one.
This CL does the following:
- Moves TranslateManager::IsTranslatableURL to TranslateService and updates
//chrome callers to call the latter.
- Adds TranslateClient::IsTranslatableURL and has TranslateManager call that.
- Moves TranslateManager unittest (only testing IsTranslatableURL) to be a
unittest on TranslateService.
BUG=360017
TBR=jochen
Review URL: https://codereview.chromium.org/
225263017
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@262427 0039d316-1c4b-4281-b951-d872f2087c98