Revert of Implements RLZTrackerDelegate on iOS.

ios/chrome/browser/rlz/rlz_tracker_delegate_impl.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 IOS_CHROME_BROWSER_RLZ_RLZ_TRACKER_DELEGATE_IMPL_H_
-#define IOS_CHROME_BROWSER_RLZ_RLZ_TRACKER_DELEGATE_IMPL_H_
-
-#include "base/callback.h"
-#include "base/callback_list.h"
-#include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
-#include "components/rlz/rlz_tracker_delegate.h"
-
-struct OmniboxLog;
-
-namespace ios {
-class ChromeBrowserState;
-}
-
-// RLZTrackerDelegateImpl implements RLZTrackerDelegate abstract interface
-// and provides access to Chrome on iOS features.
-class RLZTrackerDelegateImpl : public rlz::RLZTrackerDelegate {
- public:
-  RLZTrackerDelegateImpl();
-  ~RLZTrackerDelegateImpl() override;
-
-  static bool IsGoogleDefaultSearch(ios::ChromeBrowserState* browser_state);
-  static bool IsGoogleHomepage(ios::ChromeBrowserState* browser_state);
-  static bool IsGoogleInStartpages(ios::ChromeBrowserState* browser_state);
-
- 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;
-
-  // Called when user open an URL from the Omnibox.
-  void OnURLOpenedFromOmnibox(OmniboxLog* log);
-
-  base::Closure on_omnibox_search_callback_;
-  scoped_ptr<base::CallbackList<void(OmniboxLog*)>::Subscription>
-      on_omnibox_url_opened_subscription_;
-
-  DISALLOW_COPY_AND_ASSIGN(RLZTrackerDelegateImpl);
-};
-
-#endif  // IOS_CHROME_BROWSER_RLZ_RLZ_TRACKER_DELEGATE_IMPL_H_