Don't autocomplete searches of >1 word if they've only been visited once and the user has not yet...

chrome/browser/autocomplete/search_provider.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // This file contains the Search autocomplete provider.  This provider is
 // responsible for all non-keyword autocomplete entries that start with
 // "Search <engine> for ...", including searching for the current input string,
 // search history, and search suggestions.  An instance of it gets created and
 // managed by the autocomplete controller.
 //
@@ skipping 214 matching lines @@
   // indicates whether the results correspond to the keyword provider or default
   // provider.
   void AddSuggestResultsToMap(const SuggestResults& suggest_results,
                               bool is_keyword,
                               int did_not_accept_suggestion,
                               MatchMap* map);
 
   // Determines the relevance for a particular match.  We use different scoring
   // algorithms for the different types of matches.
   int CalculateRelevanceForWhatYouTyped() const;
-  // |time| is the time at which this query was last seen. |is_keyword| is true
-  // if the search is from the keyword provider. |looks_like_url| is true if the
-  // search term would be treated as a URL if typed into the omnibox.
+  // |time| is the time at which this query was last seen.
+  // |is_primary_provider| is true if this match comes from the primary provider
+  // for the user's input (e.g. the keyword provider for a keyword input).
+  // |prevent_inline_autocomplete| is true if we should not inline autocomplete
+  // this query.
   int CalculateRelevanceForHistory(const base::Time& time,
-                                   bool looks_like_url,
-                                   bool is_keyword) const;
+                                   bool is_primary_provider,
+                                   bool prevent_inline_autocomplete) const;
   // |result_number| is the index of the suggestion in the result set from the
   // server; the best suggestion is suggestion number 0.  |is_keyword| is true
   // if the search is from the keyword provider.
   int CalculateRelevanceForSuggestion(size_t num_results,
                                       size_t result_number,
                                       bool is_keyword) const;
   // |result_number| is same as above. |is_keyword| is true if the navigation
   // result was suggested by the keyword provider.
   int CalculateRelevanceForNavigation(size_t num_results,
                                       size_t result_number,
@@ skipping 68 matching lines @@
   // Has FinalizeInstantQuery been invoked since the last |Start|?
   bool instant_finalized_;
 
   // The |suggest_text| parameter passed to FinalizeInstantQuery.
   string16 default_provider_suggest_text_;
 
   DISALLOW_COPY_AND_ASSIGN(SearchProvider);
 };
 
 #endif  // CHROME_BROWSER_AUTOCOMPLETE_SEARCH_PROVIDER_H_