Always allow exact match non-substituting keywords.

chrome/browser/autocomplete/keyword_provider.h

 // Copyright (c) 2010 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 keyword autocomplete provider. The keyword provider
 // is responsible for remembering/suggesting user "search keyword queries"
 // (e.g.  "imdb Godzilla") and then fixing them up into valid URLs.  An
 // instance of it gets created and managed by the autocomplete controller.
 // KeywordProvider uses a TemplateURLModel to find the set of keywords.
 //
@@ skipping 91 matching lines @@
                                         string16* remaining_input);
 
   // Fills in the "destination_url" and "contents" fields of |match| with the
   // provided user input and keyword data.
   static void FillInURLAndContents(
       const string16& remaining_input,
       const TemplateURL* element,
       AutocompleteMatch* match);
 
   // Determines the relevance for some input, given its type, whether the user
-  // typed the complete keyword, and whether the keyword needs query text (true
-  // if the keyword supports replacement and the user isn't in "prefer keyword
-  // matches" mode).
+  // typed the complete keyword, and whether the user is in "prefer keyword
+  // matches" mode, and whether the keyword supports replacement.
   // If |allow_exact_keyword_match| is false, the relevance for complete
-  // keywords is degraded.
+  // keywords that support replacements is degraded.
   static int CalculateRelevance(AutocompleteInput::Type type,
                                 bool complete,
-                                bool no_query_text_needed,
+                                bool prefer_keyword,

[Peter Kasting, 2011/01/25 23:20:44]

Nit: Super minor, but it might be better to swap |prefer_keyword| and
|support_replacement| as that groups together the flags about the keyword itself
and then the flags about the current autocomplete system state.

[James Su, 2011/01/26 00:53:31]

Done.

+                                bool support_replacement,
                                 bool allow_exact_keyword_match);
 
   // Creates a fully marked-up AutocompleteMatch from the user's input.
   // If |relevance| is negative, calculate a relevance based on heuristics.
   AutocompleteMatch CreateAutocompleteMatch(
       TemplateURLModel* model,
       const string16& keyword,
       const AutocompleteInput& input,
       size_t prefix_length,
       const string16& remaining_input,
@@ skipping 27 matching lines @@
   // If non-empty, holds the ID of the extension whose keyword is currently in
   // the URL bar while the autocomplete popup is open.
   std::string current_keyword_extension_id_;
 
   NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(KeywordProvider);
 };
 
 #endif  // CHROME_BROWSER_AUTOCOMPLETE_KEYWORD_PROVIDER_H_