Remove search::IsQueryExtractionEnabled

ios/chrome/browser/search/search_util.mm

-// 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.
-
-#include "ios/chrome/browser/search/search_util.h"
-
-#include "components/search/search.h"
-#include "components/search_engines/template_url_service.h"
-#include "ios/chrome/browser/browser_state/chrome_browser_state.h"
-#include "ios/chrome/browser/search_engines/template_url_service_factory.h"
-#include "ios/chrome/browser/search_engines/ui_thread_search_terms_data.h"
-#include "ios/web/public/navigation_item.h"
-#import "ios/web/public/navigation_manager.h"
-#include "ios/web/public/web_state/web_state.h"
-#include "url/gurl.h"
-
-namespace {
-
-TemplateURL* GetDefaultSearchProviderTemplateURL(
-    ios::ChromeBrowserState* browser_state) {
-  if (!browser_state)
-    return nullptr;
-
-  TemplateURLService* template_url_service =
-      ios::TemplateURLServiceFactory::GetForBrowserState(browser_state);
-  return template_url_service ? template_url_service->GetDefaultSearchProvider()
-                              : nullptr;
-}
-
-}  // namespace
-
-base::string16 ExtractSearchTermsFromURL(ios::ChromeBrowserState* browser_state,
-                                         const GURL& url) {
-  base::string16 search_terms;
-  TemplateURL* template_url =
-      GetDefaultSearchProviderTemplateURL(browser_state);
-  if (template_url) {
-    template_url->ExtractSearchTermsFromURL(
-        url, ios::UIThreadSearchTermsData(browser_state), &search_terms);
-  }
-  return search_terms;
-}
-
-bool IsQueryExtractionAllowedForURL(ios::ChromeBrowserState* browser_state,
-                                    const GURL& url) {
-  TemplateURL* template_url =
-      GetDefaultSearchProviderTemplateURL(browser_state);
-  return template_url && search::IsSuitableURLForInstant(url, template_url);
-}
-
-base::string16 GetSearchTerms(web::WebState* web_state) {
-  if (!web_state)
-    return base::string16();
-
-  web::NavigationItem* item =
-      web_state->GetNavigationManager()->GetVisibleItem();
-  if (!item)
-    return base::string16();
-
-  if (!search::IsQueryExtractionEnabled())
-    return base::string16();
-
-  ios::ChromeBrowserState* browser_state =
-      ios::ChromeBrowserState::FromBrowserState(web_state->GetBrowserState());
-  if (!IsQueryExtractionAllowedForURL(browser_state, item->GetVirtualURL()))
-    return base::string16();
-
-  return ExtractSearchTermsFromURL(browser_state, item->GetVirtualURL());
-}