components: Move PrefRegistrySyncable into user_prefs namespace.

BUG=180785
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Review URL: https://chromiumcodereview.appspot.com/14622003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@198384 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/prefs/browser_prefs.cc b/chrome/browser/prefs/browser_prefs.cc
index 77581f3..05181bc8 100644
--- a/chrome/browser/prefs/browser_prefs.cc
+++ b/chrome/browser/prefs/browser_prefs.cc
@@ -270,7 +270,7 @@
 #endif
 }
 
-void RegisterUserPrefs(PrefRegistrySyncable* registry) {
+void RegisterUserPrefs(user_prefs::PrefRegistrySyncable* registry) {
   // User prefs. Please keep this list alphabetized.
   AlternateErrorPageTabObserver::RegisterUserPrefs(registry);
   autofill::AutofillDialogControllerImpl::RegisterUserPrefs(registry);
@@ -373,8 +373,10 @@
 
   // Prefs registered only for migration (clearing or moving to a new
   // key) go here.
-  registry->RegisterDictionaryPref(kBackupPref, new DictionaryValue(),
-                                   PrefRegistrySyncable::UNSYNCABLE_PREF);
+  registry->RegisterDictionaryPref(
+      kBackupPref,
+      new DictionaryValue(),
+      user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 }
 
 void MigrateUserPrefs(Profile* profile) {