Add finch flag for rendering a recently closed link on the local ntp.

chrome/browser/search/search.h

Index: chrome/browser/search/search.h
diff --git a/chrome/browser/search/search.h b/chrome/browser/search/search.h
index 07ab5173ca3d44fa431e4b2456ec958e835858c7..98ccb88f47ace475285470d37bb9db1afd2a50d7 100644
--- a/chrome/browser/search/search.h
+++ b/chrome/browser/search/search.h
@@ -120,6 +120,10 @@ bool IsInstantEnabled(Profile* profile);
 // trials.
 bool IsAggressiveLocalNTPFallbackEnabled();
 
+// Returns true if the recently closed link should be shown on the local NTP in
+// field trials.
+bool ShouldShowRecentlyClosedOnNTP();
+
 // Returns true if |my_url| matches |other_url|.
 bool MatchesOriginAndPath(const GURL& my_url, const GURL& other_url);