GitLab

In preparation for sharing //chrome's SSLErrorHandler implementation,
this CL makes CaptivePortalService available in WebLayer by adding a
KeyedServiceFactory for it. //chrome's SSLErrorHandler requires a
CaptivePortalService when captive portal detection is enabled (which
it is on desktop platforms, i.e., Linux). The factory is modeled after
that from //chrome, with a difference for the //weblayer environment:
- The PrefService is passed via user_prefs::UserPrefs::Get() rather
  than via Profile::GetPrefs(). //weblayer's BrowserContextImpl has
  no getter for the PrefService, and as that getter is just a synonym
  for user_prefs::UserPrefs::Get() in //chrome, I see no reason to add
  it here.

Note that this CL (and the bringup of support for Chrome's captive
portal detection in WebLayer) will have no impact on Android, where
Chrome's captive portal detection service is not enabled as
SSLErrorHandler relies on the OS support.

As this is the first instance of a KeyedServiceFactory in //weblayer,
this CL also brings up the KeyedServiceFactory infrastructure in the
//weblayer embedder.

Bug: 1030692
Change-Id: Ic24c8a003f53598f9dd08f0da0ac87869398074f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2022671Reviewed-by: Evan Stade <estade@chromium.org>
Commit-Queue: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736777}