Remove kDistroDict from Preferences.

chrome/browser/rlz/chrome_rlz_tracker_delegate.h

Index: chrome/browser/rlz/chrome_rlz_tracker_delegate.h
diff --git a/chrome/browser/rlz/chrome_rlz_tracker_delegate.h b/chrome/browser/rlz/chrome_rlz_tracker_delegate.h
index 1fdc71aafa598e9be61939dde6dee45f2c7f7412..1fe2eaaef554a026f018b61c03cfb5f31d6c7f93 100644
--- a/chrome/browser/rlz/chrome_rlz_tracker_delegate.h
+++ b/chrome/browser/rlz/chrome_rlz_tracker_delegate.h
@@ -14,6 +14,10 @@
 
 class Profile;
 
+namespace user_prefs {
+class PrefRegistrySyncable;
+}
+
 // ChromeRLZTrackerDelegate implements RLZTrackerDelegate abstract interface
 // and provides access to Chrome features.
 class ChromeRLZTrackerDelegate : public rlz::RLZTrackerDelegate,
@@ -22,6 +26,8 @@ class ChromeRLZTrackerDelegate : public rlz::RLZTrackerDelegate,
   ChromeRLZTrackerDelegate();
   ~ChromeRLZTrackerDelegate() override;
 
+  static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
+
   static bool IsGoogleDefaultSearch(Profile* profile);
   static bool IsGoogleHomepage(Profile* profile);
   static bool IsGoogleInStartpages(Profile* profile);