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

chrome/browser/history/history_backend.h

Index: chrome/browser/history/history_backend.h
diff --git a/chrome/browser/history/history_backend.h b/chrome/browser/history/history_backend.h
index 057b0f54c71b39284f2e155ee9d8d043ae980bc6..1ecf80cf5d182b658081f37143109d8f803576cb 100644
--- a/chrome/browser/history/history_backend.h
+++ b/chrome/browser/history/history_backend.h
@@ -239,6 +239,8 @@ class HistoryBackend : public base::RefCountedThreadSafe<HistoryBackend>,
 
   void SetFaviconOutOfDateForPage(const GURL& page_url);
 
+  void CloneFavicon(const GURL& old_page_url, const GURL& new_page_url);
+
   void SetImportedFavicons(
       const std::vector<ImportedFaviconUsage>& favicon_usage);
 
@@ -372,6 +374,8 @@ class HistoryBackend : public base::RefCountedThreadSafe<HistoryBackend>,
   FRIEND_TEST_ALL_PREFIXES(HistoryBackendTest, AddOrUpdateIconMapping);
   FRIEND_TEST_ALL_PREFIXES(HistoryBackendTest, GetMostRecentVisits);
   FRIEND_TEST_ALL_PREFIXES(HistoryBackendTest, GetFaviconForURL);
+  FRIEND_TEST_ALL_PREFIXES(HistoryBackendTest,
+                           CloneFaviconIsRestrictedToSameDomain);
 
   friend class ::TestingProfile;