Make HistoryContentsProvider results deletable

chrome/browser/autocomplete/history_contents_provider.h

Index: chrome/browser/autocomplete/history_contents_provider.h
diff --git a/chrome/browser/autocomplete/history_contents_provider.h b/chrome/browser/autocomplete/history_contents_provider.h
index 31b75ecba9022330b7d597f7520fc6b2f9a9e1b2..73501f1b9cf7c6d12d2d50fedb7be5c20bf91248 100644
--- a/chrome/browser/autocomplete/history_contents_provider.h
+++ b/chrome/browser/autocomplete/history_contents_provider.h
@@ -27,9 +27,11 @@ class HistoryContentsProvider : public AutocompleteProvider {
   // As necessary asks the history service for the relevant results. When
   // done SetResults is invoked.
   virtual void Start(const AutocompleteInput& input,
-                     bool minimal_changes);
+                     bool minimal_changes) OVERRIDE;
 
-  virtual void Stop();
+  virtual void Stop() OVERRIDE;
+
+  virtual void DeleteMatch(const AutocompleteMatch& match) OVERRIDE;
 
   // Returns the total number of matches available in the database, up to
   // kMaxMatchCount, whichever is smaller.