Initial implementation of dedupping search provider's URLs.

chrome/browser/autocomplete/autocomplete_match.h

Index: chrome/browser/autocomplete/autocomplete_match.h
diff --git a/chrome/browser/autocomplete/autocomplete_match.h b/chrome/browser/autocomplete/autocomplete_match.h
index f459578bb027f3f012342998b33a6066be4c94c5..551b9ef1f72788281edbc06331a5aa2c84ef1714 100644
--- a/chrome/browser/autocomplete/autocomplete_match.h
+++ b/chrome/browser/autocomplete/autocomplete_match.h
@@ -187,7 +187,11 @@ struct AutocompleteMatch {
   // remove likely duplicates; these URLs are not used as actual
   // destination URLs.  This method is invoked internally by the
   // AutocompleteResult and does not normally need to be invoked.
-  void ComputeStrippedDestinationURL();
+  // If |search_provider_url| is not NULL, it is used to normalize
+  // URLs that might have been generated by the default search provider.

[Peter Kasting, 2012/10/19 22:49:33]

We should not pass this in.

If the match has an associated TemplateURL already, then clearly that's the
TemplateURL to use for normalization.  Otherwise, we should use the TemplateURL
machinery to dynamically calculate the matching TemplateURL, if any, for the
destination URL.  (This handles matches from the history providers.)  The result
of this is that we'll de-dupe properly for non-DSPs as well, and the callers
will be insulated from all this complexity to boot.

I don't know whether GetTemplateURL() can be changed to do this -- you'd have to
check the callers to see whether returning a non-NULL template URL for a "URL
from history" result.  My suspicion is that it can, but maybe we don't want to
unless we make it cache the calculation result.

+  // This is in particular important for all URLs with time/position sensitive
+  // CGI params that need to be stripped off.
+  void ComputeStrippedDestinationURL(TemplateURL* search_provider_url);
 
   // Gets data relevant to whether there should be any special keyword-related
   // UI shown for this match.  If this match represents a selected keyword, i.e.