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

chrome/browser/search_engines/ui_thread_search_terms_data.h

Index: chrome/browser/search_engines/ui_thread_search_terms_data.h
diff --git a/chrome/browser/search_engines/ui_thread_search_terms_data.h b/chrome/browser/search_engines/ui_thread_search_terms_data.h
index 279e6d5706921f107c8e336d4a9605360ffbc8c6..78e4b7df441424927a5f1e91037b21a89c14fd52 100644
--- a/chrome/browser/search_engines/ui_thread_search_terms_data.h
+++ b/chrome/browser/search_engines/ui_thread_search_terms_data.h
@@ -27,7 +27,7 @@ class UIThreadSearchTermsData : public SearchTermsData {
   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;