Revert "Omnibox - Zero Suggest - Log When/Whether Contextual Search is Possible"

components/omnibox/browser/zero_suggest_provider.h

Index: components/omnibox/browser/zero_suggest_provider.h
diff --git a/components/omnibox/browser/zero_suggest_provider.h b/components/omnibox/browser/zero_suggest_provider.h
index b682e7b7ebeae82302f574d6d2c916e2b7a9d35a..d4cf4165f8c8b97353ae5321d417ddcfd2cb35eb 100644
--- a/components/omnibox/browser/zero_suggest_provider.h
+++ b/components/omnibox/browser/zero_suggest_provider.h
@@ -122,12 +122,6 @@ class ZeroSuggestProvider : public BaseSearchProvider,
   bool ShouldShowNonContextualZeroSuggest(const GURL& suggest_url,
                                           const GURL& current_page_url) const;
 
-  // Returns a URL string that should be used to to request contextual
-  // suggestions from the default provider.  Does not take into account whether
-  // sending this request is prohibited (e.g., in an incognito window).  Returns
-  // an empty string in case of an error.
-  std::string GetContextualSuggestionsUrl() const;
-
   // Checks whether we have a set of zero suggest results cached, and if so
   // populates |matches_| with cached results.
   void MaybeUseCachedSuggestions();