Hoist TrimHttpPrefix() so we only have one copy, not one per provider....

chrome/browser/autocomplete/history_url_provider.h

Index: chrome/browser/autocomplete/history_url_provider.h
===================================================================
--- chrome/browser/autocomplete/history_url_provider.h	(revision 17014)
+++ chrome/browser/autocomplete/history_url_provider.h	(working copy)
@@ -255,10 +255,6 @@
   // output that surprises the user ("Search Google for xn--6ca.com").
   static std::wstring FixupUserInput(const AutocompleteInput& input);
 
-  // Trims "http:" and up to two subsequent slashes from |url|.  Returns the
-  // number of characters that were trimmed.
-  static size_t TrimHttpPrefix(std::wstring* url);
-
   // Returns true if |url| is just a host (e.g. "http://www.google.com/") and
   // not some other subpage (e.g. "http://www.google.com/foo.html").
   static bool IsHostOnly(const GURL& url);