Cleanup: Remove for_search param from search::InstantExtendedEnabledParam()

chrome/browser/search_engines/ui_thread_search_terms_data.h

 // Copyright 2014 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 CHROME_BROWSER_SEARCH_ENGINES_UI_THREAD_SEARCH_TERMS_DATA_H_
 #define CHROME_BROWSER_SEARCH_ENGINES_UI_THREAD_SEARCH_TERMS_DATA_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/strings/string16.h"
 #include "components/search_engines/search_terms_data.h"
 
 class Profile;
 
 // Implementation of SearchTermsData that is only usable on the UI thread.
 class UIThreadSearchTermsData : public SearchTermsData {
  public:
   // If |profile_| is NULL, the Google base URL accessors will return default
   // values, and NTPIsThemedParam() will return an empty string.
   explicit UIThreadSearchTermsData(Profile* profile);
 
   std::string GoogleBaseURLValue() const override;
   std::string GetApplicationLocale() const override;
   base::string16 GetRlzParameterValue(bool from_app_list) const override;
   std::string GetSearchClient() const override;
   std::string GetSuggestClient() const override;
   std::string GetSuggestRequestIdentifier() const override;
-  std::string InstantExtendedEnabledParam(bool for_search) const override;
+  std::string InstantExtendedEnabledParam() const override;
   std::string ForceInstantResultsParam(bool for_prerender) const override;
   std::string GoogleImageSearchSource() const override;
 
   // Used by tests to override the value for the Google base URL.  Passing the
   // empty string cancels this override.
   static void SetGoogleBaseURL(const std::string& base_url);
 
  private:
   static std::string* google_base_url_;
   Profile* profile_;
 
   DISALLOW_COPY_AND_ASSIGN(UIThreadSearchTermsData);
 };
 
 #endif  // CHROME_BROWSER_SEARCH_ENGINES_UI_THREAD_SEARCH_TERMS_DATA_H_