components: Extract pref_registry component out of user_prefs.

The reason for doing this is that user_prefs depends on content_browser,
which brings a lot of extra dependencies that takes a lot of time to build
(yeah, I'm looking at you Blink and V8) and bookmarks is one of the targets
that should not depend on content.

BUG=359565
TEST=green trybots
[email protected], [email protected], [email protected]

Review URL: https://codereview.chromium.org/271793003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@270722 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/DEPS b/chrome/browser/DEPS
index e7640558..b6f8b83 100644
--- a/chrome/browser/DEPS
+++ b/chrome/browser/DEPS
@@ -36,6 +36,7 @@
   "+components/password_manager",
   "+components/policy",
   "+components/precache",
+  "+components/pref_registry",
   "+components/query_parser",
   "+components/rappor",
   "+components/search_provider_logos",