Partially componentize //chrome/browser/search/search.{h,cc}

ios/public/test/fake_search_provider.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_PUBLIC_TEST_FAKE_SEARCH_PROVIDER_H_
 #define IOS_PUBLIC_TEST_FAKE_SEARCH_PROVIDER_H_
 
 #include "ios/public/provider/chrome/browser/search_provider.h"
 
 namespace ios {
 
 class FakeSearchProvider : public ios::SearchProvider {
  public:
   FakeSearchProvider();
   ~FakeSearchProvider() override;
 
  private:
   // ios::SearchProvider implementation.
-  bool IsQueryExtractionEnabled() override;
-  std::string InstantExtendedEnabledParam(bool for_search) override;
-  std::string ForceInstantResultsParam(bool for_prerender) override;
-  int OmniboxStartMargin() override;
   std::string GoogleImageSearchSource() override;
 
   DISALLOW_COPY_AND_ASSIGN(FakeSearchProvider);
 };
 
 }  // namespace ios
 
 #endif  // IOS_PUBLIC_TEST_FAKE_SEARCH_PROVIDER_H_