Remove call to GetBlockingPool in RLZ

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"
@@ skipping 18 matching lines @@
   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;
   bool GetBrand(std::string* brand) override;
   bool IsBrandOrganic(const std::string& brand) override;
   bool GetReactivationBrand(std::string* brand) override;
   bool ShouldEnableZeroDelayForTesting() override;
   bool GetLanguage(base::string16* language) override;
   bool GetReferral(base::string16* referral) override;
   bool ClearReferral() override;
   void SetOmniboxSearchCallback(const base::Closure& callback) override;
   void SetHomepageSearchCallback(const base::Closure& callback) override;
@@ skipping 12 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_