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This CL adds the first pieces of infrastructure that will be necessary
to integrate //components/translate in WebLayer:
- Registration of the relevant prefs
- A KeyedServiceFactory for the first of several services that will be
  needed to glue the component to //weblayer

The factory is adapted in a straightforward way from the corresponding
one in //chrome.

Bug: 1025620
Change-Id: I4832388b45cfcf6b70ea06245a82aee1c4bb3326
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2152815
Commit-Queue: Colin Blundell <blundell@chromium.org>
Reviewed-by: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760429}