Remove WebHistoryItem child usage

content/renderer/history_serialization.h

Index: content/renderer/history_serialization.h
diff --git a/content/renderer/history_serialization.h b/content/renderer/history_serialization.h
index 6160fd3b34b9072fe0dd41c0c4c727b2a48fb537..03758ba9923afabd27abc0170f911adad013afd3 100644
--- a/content/renderer/history_serialization.h
+++ b/content/renderer/history_serialization.h
@@ -14,12 +14,13 @@ class WebHistoryItem;
 }
 
 namespace content {
+class HistoryEntry;
 class PageState;
 
-CONTENT_EXPORT PageState HistoryItemToPageState(
+CONTENT_EXPORT PageState HistoryEntryToPageState(HistoryEntry* entry);
+CONTENT_EXPORT PageState SingleHistoryItemToPageState(
     const blink::WebHistoryItem& item);
-CONTENT_EXPORT blink::WebHistoryItem PageStateToHistoryItem(
-    const PageState& state);
+CONTENT_EXPORT HistoryEntry* PageStateToHistoryEntry(const PageState& state);
 
 }  // namespace content