Change FrameTreeNode id from int64 to int.

content/browser/frame_host/navigation_controller_impl.cc

Index: content/browser/frame_host/navigation_controller_impl.cc
diff --git a/content/browser/frame_host/navigation_controller_impl.cc b/content/browser/frame_host/navigation_controller_impl.cc
index 8c9f0332d62ca36934acfa1dd85c16691fa8e209..22777840a6cfab788142e3d63935f9a704defb71 100644
--- a/content/browser/frame_host/navigation_controller_impl.cc
+++ b/content/browser/frame_host/navigation_controller_impl.cc
@@ -1323,7 +1323,7 @@ bool NavigationControllerImpl::RendererDidNavigateAutoSubframe(
           switches::kSitePerProcess)) {
     // This may be a "new auto" case where we add a new FrameNavigationEntry, or
     // it may be a "history auto" case where we update an existing one.
-    int64 frame_tree_node_id = rfh->frame_tree_node()->frame_tree_node_id();
+    int frame_tree_node_id = rfh->frame_tree_node()->frame_tree_node_id();
     NavigationEntryImpl* last_committed = GetLastCommittedEntry();
     last_committed->AddOrUpdateFrameEntry(frame_tree_node_id,
                                           rfh->GetSiteInstance(),