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

components/omnibox/browser/url_index_private_data.h

Index: components/omnibox/browser/url_index_private_data.h
diff --git a/components/omnibox/browser/url_index_private_data.h b/components/omnibox/browser/url_index_private_data.h
index 90ab17136318b81036ba455adad612d311de7744..90fb64bdb4d8a0a7a9a6f6ac4f6f7fb6e24df0ff 100644
--- a/components/omnibox/browser/url_index_private_data.h
+++ b/components/omnibox/browser/url_index_private_data.h
@@ -184,6 +184,7 @@ class URLIndexPrivateData
                         const HistoryIDSet& history_id_set);
     // Creates a cache item for a term which has no results.
     SearchTermCacheItem();
+    SearchTermCacheItem(const SearchTermCacheItem& other);
 
     ~SearchTermCacheItem();
 
@@ -203,6 +204,7 @@ class URLIndexPrivateData
                     const base::string16& lower_string,
                     const String16Vector& lower_terms,
                     const base::Time now);
+    AddHistoryMatch(const AddHistoryMatch& other);
     ~AddHistoryMatch();
 
     void operator()(const HistoryID history_id);