Remove wstring from autocomplete.

chrome/browser/autocomplete/history_url_provider.h

Index: chrome/browser/autocomplete/history_url_provider.h
===================================================================
--- chrome/browser/autocomplete/history_url_provider.h	(revision 72388)
+++ chrome/browser/autocomplete/history_url_provider.h	(working copy)
@@ -192,7 +192,7 @@
   // match's URL to just a host.  If this host still matches the user input,
   // return it.  Returns the empty string on failure.
   static GURL ConvertToHostOnly(const history::HistoryMatch& match,
-                                const std::wstring& input);
+                                const string16& input);
 
   // See if a shorter version of the best match should be created, and if so
   // place it at the front of |matches|.  This can suggest history URLs that
@@ -216,7 +216,7 @@
   // |promote| is false, existing matches are left in place, and newly added
   // matches are placed at the back.
   static void EnsureMatchPresent(const history::URLRow& info,
-                                 std::wstring::size_type input_location,
+                                 string16::size_type input_location,
                                  bool match_in_scheme,
                                  history::HistoryMatches* matches,
                                  bool promote);
@@ -232,7 +232,7 @@
   // prefix.  This is useful when you need to figure out the innermost match
   // for some user input in a URL.
   const history::Prefix* BestPrefix(const GURL& text,
-                                    const std::wstring& prefix_suffix) const;
+                                    const string16& prefix_suffix) const;
 
   // Returns a match corresponding to exactly what the user has typed.
   AutocompleteMatch SuggestExactInput(const AutocompleteInput& input,