Provide assumed favicon for intents if service provider page was never visited.

chrome/browser/history/history.h

Index: chrome/browser/history/history.h
diff --git a/chrome/browser/history/history.h b/chrome/browser/history/history.h
index c6f257bbdf75852c49034a9c574e542875eb5431..74b5ce8851121309c46c9c0365fb3faae4ed87f6 100644
--- a/chrome/browser/history/history.h
+++ b/chrome/browser/history/history.h
@@ -666,6 +666,10 @@ class HistoryService : public CancelableRequestProvider,
   // of date.
   void SetFaviconOutOfDateForPage(const GURL& page_url);
 
+  // Used by the FaviconService to clone favicons from one page to another,
+  // provided that other page does not already have favicons.
+  void CloneFavicon(const GURL& old_page_url, const GURL& new_page_url);
+
   // Used by the FaviconService for importing many favicons for many pages at
   // once. The pages must exist, any favicon sets for unknown pages will be
   // discarded. Existing favicons will not be overwritten.