Remove a variety of no-longer-used query params.

ios/chrome/browser/search_engines/ui_thread_search_terms_data.h

Index: ios/chrome/browser/search_engines/ui_thread_search_terms_data.h
diff --git a/ios/chrome/browser/search_engines/ui_thread_search_terms_data.h b/ios/chrome/browser/search_engines/ui_thread_search_terms_data.h
index 0c8a2c29b335dd733574d3742545ac61cf53bc74..b522a5e514e165ac01bf3144ab2071c49093795e 100644
--- a/ios/chrome/browser/search_engines/ui_thread_search_terms_data.h
+++ b/ios/chrome/browser/search_engines/ui_thread_search_terms_data.h
@@ -26,11 +26,8 @@ class UIThreadSearchTermsData : public SearchTermsData {
   std::string GetSearchClient() const override;
   std::string GetSuggestClient() const override;
   std::string GetSuggestRequestIdentifier() const override;
-  bool IsShowingSearchTermsOnSearchResultsPages() const override;
   std::string InstantExtendedEnabledParam(bool for_search) const override;
   std::string ForceInstantResultsParam(bool for_prerender) const override;
-  int OmniboxStartMargin() const override;
-  std::string NTPIsThemedParam() const override;
   std::string IOSWebViewTypeParam() const override;
   std::string GoogleImageSearchSource() const override;