Stop depending on InstantService from BaseSearchProvider

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 1b70a101955db6d0f435e43fafa45310150458fe..a9a41c595ff2341500b8013688a83f04bc2e1255 100644
--- a/components/search_engines/search_terms_data.h
+++ b/components/search_engines/search_terms_data.h
@@ -63,6 +63,9 @@ class SearchTermsData {
   // incrementally.
   virtual std::string ForceInstantResultsParam(bool for_prerender) const;
 
+  // Returns the start-edge margin of the omnibox in pixels.
+  virtual int OmniboxStartMargin() const;
+
   // Returns a string indicating whether a non-default theme is active,
   // suitable for adding as a query string param to the homepage.  This only
   // applies if Instant Extended is enabled.  Returns an empty string otherwise.