Remove search::IsQueryExtractionEnabled

ios/chrome/browser/search/search_util.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_SEARCH_SEARCH_UTIL_H_
-#define IOS_CHROME_BROWSER_SEARCH_SEARCH_UTIL_H_
-
-#include "base/strings/string16.h"
-
-class GURL;
-
-namespace ios {
-class ChromeBrowserState;
-}
-
-namespace web {
-class WebState;
-}
-
-// Extracts and returns search terms from |url|. Does not consider
-// IsQueryExtractionEnabled() and Instant support state of the page and does
-// not check for a privileged process, so most callers should use
-// GetSearchTerms() below instead.
-base::string16 ExtractSearchTermsFromURL(ios::ChromeBrowserState* browser_state,
-                                         const GURL& url);
-
-// Returns true if it is okay to extract search terms from |url|. |url| must
-// have a secure scheme and must contain the search terms replacement key for
-// the default search provider.
-bool IsQueryExtractionAllowedForURL(ios::ChromeBrowserState* browser_state,
-                                    const GURL& url);
-
-// Returns search terms if this WebState is a search results page. It looks
-// in the visible NavigationItem first, to see if search terms have already
-// been extracted. Failing that, it tries to extract search terms from the URL.
-//
-// Returns a blank string if search terms were not found, or if search terms
-// extraction is disabled for this WebState or BrowserState, or if |web_state|
-// does not support Instant.
-base::string16 GetSearchTerms(web::WebState* web_state);
-
-#endif  // IOS_CHROME_BROWSER_SEARCH_SEARCH_UTIL_H_