Partially componentize //chrome/browser/search/search.{h,cc}

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 5351bd9203dad2fe0f1ebe5fff77138c5db568ce..9e3d00b879f49dd5a88587521c512a92af1d981c 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
@@ -81,7 +81,7 @@ std::string UIThreadSearchTermsData::GetSearchClient() const {
 
 std::string UIThreadSearchTermsData::GetSuggestClient() const {
   DCHECK(thread_checker_.CalledOnValidThread());
-  return chrome::IsInstantExtendedAPIEnabled() ? "chrome-omni" : "chrome";
+  return search::IsInstantExtendedAPIEnabled() ? "chrome-omni" : "chrome";
 }
 
 std::string UIThreadSearchTermsData::GetSuggestRequestIdentifier() const {
@@ -91,37 +91,31 @@ std::string UIThreadSearchTermsData::GetSuggestRequestIdentifier() const {
 
 bool UIThreadSearchTermsData::IsShowingSearchTermsOnSearchResultsPages() const {
   DCHECK(thread_checker_.CalledOnValidThread());
-  return chrome::IsInstantExtendedAPIEnabled() &&
-         ios::GetChromeBrowserProvider()
-             ->GetSearchProvider()
-             ->IsQueryExtractionEnabled();
+  return search::IsInstantExtendedAPIEnabled() &&
+         search::IsQueryExtractionEnabled();
 }
 
 std::string UIThreadSearchTermsData::InstantExtendedEnabledParam(
     bool for_search) const {
   DCHECK(thread_checker_.CalledOnValidThread());
-  return ios::GetChromeBrowserProvider()
-      ->GetSearchProvider()
-      ->InstantExtendedEnabledParam(for_search);
+  return search::InstantExtendedEnabledParam(for_search);
 }
 
 std::string UIThreadSearchTermsData::ForceInstantResultsParam(
     bool for_prerender) const {
   DCHECK(thread_checker_.CalledOnValidThread());
-  return ios::GetChromeBrowserProvider()
-      ->GetSearchProvider()
-      ->ForceInstantResultsParam(for_prerender);
+  return search::ForceInstantResultsParam(for_prerender);
 }
 
 int UIThreadSearchTermsData::OmniboxStartMargin() const {
   DCHECK(thread_checker_.CalledOnValidThread());
-  return ios::GetChromeBrowserProvider()
-      ->GetSearchProvider()
-      ->OmniboxStartMargin();
+  // 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();
 }