Do not delay most visited results.

chrome/browser/autocomplete/zero_suggest_provider.h

Index: chrome/browser/autocomplete/zero_suggest_provider.h
diff --git a/chrome/browser/autocomplete/zero_suggest_provider.h b/chrome/browser/autocomplete/zero_suggest_provider.h
index aaeaa6f88251564efd9f2933ddc06e6b178439b0..3e2e95576df1dd87c0bc00d05a54fb63b3b2aa69 100644
--- a/chrome/browser/autocomplete/zero_suggest_provider.h
+++ b/chrome/browser/autocomplete/zero_suggest_provider.h
@@ -119,10 +119,11 @@ class ZeroSuggestProvider : public BaseSearchProvider,
   // Returns the relevance score for the verbatim result.
   int GetVerbatimRelevance() const;
 
-  // Whether we can show zero suggest on |current_page_url| without
-  // sending |current_page_url| as a parameter to the server at |suggest_url|.
-  bool CanShowZeroSuggestWithoutSendingURL(const GURL& suggest_url,
-                                           const GURL& current_page_url) const;
+  // Whether we can show zero suggest without sending |current_page_url| to
+  // |suggest_url| search provider. Also checks that other conditions for
+  // non-contextual zero suggest are satisfied.
+  bool ShouldShowNonContextualZeroSuggest(const GURL& suggest_url,
+                                          const GURL& current_page_url) const;
 
   // Checks whether we have a set of zero suggest results cached, and if so
   // populates |matches_| with cached results.
@@ -156,6 +157,9 @@ class ZeroSuggestProvider : public BaseSearchProvider,
 
   history::MostVisitedURLList most_visited_urls_;
 
+  // Whether we are waiting for a most visited visited urls callback to run.
+  bool most_visited_urls_requested_;

[Mark P, 2014/10/22 19:11:23]

optional nit: consider calling this something like
most_visited_urls_request_pending_ or waiting_for_most_visited_urls_request_.
With the current name, I found it surprising when you set it to false
immediately after you received results.

[Maria, 2014/10/23 20:34:26]

Done.

+
   // For callbacks that may be run after destruction.
   base::WeakPtrFactory<ZeroSuggestProvider> weak_ptr_factory_;