Add the ability to check the CSD Whitelist asynchronously, for PhishGuard.

chrome/browser/safe_browsing/local_database_manager.h

Index: chrome/browser/safe_browsing/local_database_manager.h
diff --git a/chrome/browser/safe_browsing/local_database_manager.h b/chrome/browser/safe_browsing/local_database_manager.h
index 185aa470d4a0ef3af947d3729e748232f8513c0d..0ed5804c03d217baf280d7beff1c7613a909581e 100644
--- a/chrome/browser/safe_browsing/local_database_manager.h
+++ b/chrome/browser/safe_browsing/local_database_manager.h
@@ -126,6 +126,7 @@ class LocalSafeBrowsingDatabaseManager
   bool CheckExtensionIDs(const std::set<std::string>& extension_ids,
                          Client* client) override;
   bool CheckResourceUrl(const GURL& url, Client* client) override;
+  AsyncMatch CheckCsdWhitelistUrl(const GURL& url, Client* client) override;
   bool MatchCsdWhitelistUrl(const GURL& url) override;
   bool MatchMalwareIP(const std::string& ip_address) override;
   bool MatchDownloadWhitelistUrl(const GURL& url) override;