Remove kDistroDict from Preferences.

chrome/browser/rlz/chrome_rlz_tracker_delegate.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_RLZ_CHROME_RLZ_TRACKER_DELEGATE_H_
 #define CHROME_BROWSER_RLZ_CHROME_RLZ_TRACKER_DELEGATE_H_
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "components/omnibox/browser/omnibox_event_global_tracker.h"
 #include "components/rlz/rlz_tracker_delegate.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
 class Profile;
 
+namespace user_prefs {
+class PrefRegistrySyncable;
+}
+
 // ChromeRLZTrackerDelegate implements RLZTrackerDelegate abstract interface
 // and provides access to Chrome features.
 class ChromeRLZTrackerDelegate : public rlz::RLZTrackerDelegate,
                                  public content::NotificationObserver {
  public:
   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);
 
  private:
   // RLZTrackerDelegate implementation.
   void Cleanup() override;
   bool IsOnUIThread() override;
   base::SequencedWorkerPool* GetBlockingPool() override;
   net::URLRequestContextGetter* GetRequestContext() override;
@@ skipping 21 matching lines @@
 
   // Subscription for receiving callbacks that a URL was opened from the
   // omnibox.
   std::unique_ptr<base::CallbackList<void(OmniboxLog*)>::Subscription>
       omnibox_url_opened_subscription_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeRLZTrackerDelegate);
 };
 
 #endif  // CHROME_BROWSER_RLZ_CHROME_RLZ_TRACKER_DELEGATE_H_