Abstract most Profile knowledge from SigninManager.

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index dd8b47a9216f7e288445ba7921c4351e54aa5d7d..b7f73503a795e5a7bcd93fe6992a30d5ec025869 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -1836,12 +1836,6 @@ const char kInvalidatorSavedInvalidations[] = "invalidator.saved_invalidations";
 const char kInvalidationServiceUseGCMChannel[] =
     "invalidation_service.use_gcm_channel";
 
-// Local state pref containing a string regex that restricts which accounts
-// can be used to log in to chrome (e.g. "*@google.com"). If missing or blank,
-// all accounts are allowed (no restrictions).
-const char kGoogleServicesUsernamePattern[] =
-    "google.services.username_pattern";
-
 // Local hash of authentication password, used for off-line authentication
 // when on-line authentication is not available.
 const char kGoogleServicesPasswordHash[] = "google.services.password_hash";