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

components/search_engines/search_terms_data.h

Index: components/search_engines/search_terms_data.h
diff --git a/components/search_engines/search_terms_data.h b/components/search_engines/search_terms_data.h
index c91745e8a5061ba0aa2ee3db0fc5a187b7d53a22..50f7ed2eb9391325f06b2d551cb1674f04fbc994 100644
--- a/components/search_engines/search_terms_data.h
+++ b/components/search_engines/search_terms_data.h
@@ -49,8 +49,9 @@ class SearchTermsData {
   // This implementation returns the empty string.
   virtual std::string GetSuggestRequestIdentifier() const;
 
-  // Returns a string indicating whether InstantExtended is enabled.
-  virtual std::string InstantExtendedEnabledParam(bool for_search) const;
+  // Returns a string indicating whether InstantExtended is enabled, suitable
+  // for adding as a query string param to the homepage or search requests.
+  virtual std::string InstantExtendedEnabledParam() const;
 
   // Returns a string that will cause the search results page to update
   // incrementally.