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

ios/chrome/browser/search_engines/ui_thread_search_terms_data.cc

Index: ios/chrome/browser/search_engines/ui_thread_search_terms_data.cc
diff --git a/ios/chrome/browser/search_engines/ui_thread_search_terms_data.cc b/ios/chrome/browser/search_engines/ui_thread_search_terms_data.cc
index d6e92f6a68603d09ff80a1a02368433eed69f511..ab06488b1af1507764e32c3d60ea80a8952b638d 100644
--- a/ios/chrome/browser/search_engines/ui_thread_search_terms_data.cc
+++ b/ios/chrome/browser/search_engines/ui_thread_search_terms_data.cc
@@ -91,12 +91,6 @@ std::string UIThreadSearchTermsData::GetSuggestRequestIdentifier() const {
   return "chrome-ext-ansg";
 }
 
-bool UIThreadSearchTermsData::IsShowingSearchTermsOnSearchResultsPages() const {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  return search::IsInstantExtendedAPIEnabled() &&
-         search::IsQueryExtractionEnabled();
-}
-
 std::string UIThreadSearchTermsData::InstantExtendedEnabledParam(
     bool for_search) const {
   DCHECK(thread_checker_.CalledOnValidThread());
@@ -109,18 +103,6 @@ std::string UIThreadSearchTermsData::ForceInstantResultsParam(
   return search::ForceInstantResultsParam(for_prerender);
 }
 
-int UIThreadSearchTermsData::OmniboxStartMargin() const {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  // iOS has not InstantService.
-  return search::kDisableStartMargin;
-}
-
-std::string UIThreadSearchTermsData::NTPIsThemedParam() const {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  // iOS does not supports themed NTP.
-  return std::string();
-}
-
 std::string UIThreadSearchTermsData::IOSWebViewTypeParam() const {
   DCHECK(thread_checker_.CalledOnValidThread());
   std::string param = experimental_flags::GetWKWebViewSearchParams();