chrome: Add out-of-line copy ctors for complex classes.

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 0949d19a575b61537fa4a9c88d4c7240e3892b9c..c591aa2cbafa4fd22cf206584172a5375c2c0d20 100644
--- a/chrome/browser/safe_browsing/local_database_manager.h
+++ b/chrome/browser/safe_browsing/local_database_manager.h
@@ -175,6 +175,7 @@ class LocalSafeBrowsingDatabaseManager
                 const GURL& url,
                 const std::vector<SBThreatType>& expected_threats,
                 const base::TimeTicks& start);
+    QueuedCheck(const QueuedCheck& other);
     ~QueuedCheck();
     ListType check_type;
     Client* client;