Remove ChromeBrowserProvider::RegisterProfilePrefs().

ios/public/provider/chrome/browser/chrome_browser_provider.h

Index: ios/public/provider/chrome/browser/chrome_browser_provider.h
diff --git a/ios/public/provider/chrome/browser/chrome_browser_provider.h b/ios/public/provider/chrome/browser/chrome_browser_provider.h
index 7ba4ca52beadba34fa4e7a48b5925d94b595ee8d..b09c0fb7a7204cda3eeded4d8a961478bdac5926 100644
--- a/ios/public/provider/chrome/browser/chrome_browser_provider.h
+++ b/ios/public/provider/chrome/browser/chrome_browser_provider.h
@@ -21,7 +21,6 @@ class AppDistributionProvider;
 class BrandedImageProvider;
 class GURL;
 class OmahaServiceProvider;
-class PrefService;
 class SpotlightProvider;
 class UserFeedbackProvider;
 class VoiceSearchProvider;
@@ -39,10 +38,6 @@ namespace sync_sessions {
 class SyncedWindowDelegatesGetter;
 }
 
-namespace user_prefs {
-class PrefRegistrySyncable;
-}
-
 @protocol AppRatingPrompt;
 @protocol InfoBarViewProtocol;
 @protocol LogoVendor;
@@ -87,9 +82,6 @@ class ChromeBrowserProvider {
 
   // Asserts all iOS-specific |BrowserContextKeyedServiceFactory| are built.
   virtual void AssertBrowserContextKeyedFactoriesBuilt();
-  // Registers all prefs that will be used via a PrefService attached to a
-  // Profile.
-  virtual void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
   // Returns an instance of a signing error provider.
   virtual SigninErrorProvider* GetSigninErrorProvider();
   // Returns an instance of a signin resources provider.