Remove kDistroDict from Preferences.

chrome/browser/first_run/first_run.h

Index: chrome/browser/first_run/first_run.h
diff --git a/chrome/browser/first_run/first_run.h b/chrome/browser/first_run/first_run.h
index 001b33966a40a8427a5ef756b7bbebb58cab472f..b51318e9375d1722e7235a75014e8a3455eb7afd 100644
--- a/chrome/browser/first_run/first_run.h
+++ b/chrome/browser/first_run/first_run.h
@@ -75,7 +75,6 @@ struct MasterPrefs {
   // remove items from here which are being stored temporarily only to be later
   // dumped into local_state. Also see related TODO in chrome_browser_main.cc.
 
-  int ping_delay;
   bool homepage_defined;
   int do_import_items;
   int dont_import_items;
@@ -116,9 +115,6 @@ bool IsMetricsReportingOptIn();
 // (http://crbug.com/264694).
 void CreateSentinelIfNeeded();
 
-// Get RLZ ping delay pref name.
-std::string GetPingDelayPrefName();
-
 // Register user preferences used by the MasterPrefs structure.
 void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);