Always allow exact match non-substituting keywords.

chrome/browser/autocomplete/autocomplete.h

Index: chrome/browser/autocomplete/autocomplete.h
diff --git a/chrome/browser/autocomplete/autocomplete.h b/chrome/browser/autocomplete/autocomplete.h
index 7853f5aa8de80fb23553b28ea4965662829e9c5f..a69390bfe3667d86d371192f9c26f7bce51b20a7 100644
--- a/chrome/browser/autocomplete/autocomplete.h
+++ b/chrome/browser/autocomplete/autocomplete.h
@@ -573,7 +573,8 @@ class AutocompleteController : public ACProviderListener {
   //
   // |allow_exact_keyword_match| should be false when triggering keyword mode on
   // the input string would be surprising or wrong, e.g. when highlighting text
-  // in a page and telling the browser to search for it or navigate to it.
+  // in a page and telling the browser to search for it or navigate to it. This
+  // parameter only applies to substituting keywords.
 
   // If |synchronous_only| is true, the controller asks the providers to only
   // return matches which are synchronously available, which should mean that