Remove old history UI, and replace with history2.

chrome/browser/ui/webui/history_ui.h

Index: chrome/browser/ui/webui/history_ui.h
diff --git a/chrome/browser/ui/webui/history_ui.h b/chrome/browser/ui/webui/history_ui.h
index 4cf6fa0071d048b89b7b81c851a680b19b8d629e..fb6e28829858bc68dab8b5abd6bda3f21e4ee869 100644
--- a/chrome/browser/ui/webui/history_ui.h
+++ b/chrome/browser/ui/webui/history_ui.h
@@ -72,6 +72,9 @@ class BrowsingHistoryHandler : public WebUIMessageHandler,
   // Our consumer for delete requests to the history service.
   CancelableRequestConsumerT<int, 0> cancelable_delete_consumer_;
 
+  // The list of URLs that are in the process of being deleted.
+  std::set<GURL> urls_to_be_deleted_;
+
   DISALLOW_COPY_AND_ASSIGN(BrowsingHistoryHandler);
 };