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

ios/public/provider/chrome/browser/chrome_browser_provider.cc

 // Copyright 2013 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.
 
 #include "ios/public/provider/chrome/browser/chrome_browser_provider.h"
 
 #include "base/logging.h"
 
 namespace ios {
 
@@ skipping 82 matching lines @@
 }
 
 std::string ChromeBrowserProvider::GetRiskData() {
   return std::string();
 }
 
 rappor::RapporService* ChromeBrowserProvider::GetRapporService() {
   return nullptr;
 }
 
-SearchProvider* ChromeBrowserProvider::GetSearchProvider() {
-  return nullptr;
-}
-
 }  // namespace ios