Move ownership of source SiteInstance to the FrameNavigationEntry.

content/browser/frame_host/render_frame_host_manager.cc

Index: content/browser/frame_host/render_frame_host_manager.cc
diff --git a/content/browser/frame_host/render_frame_host_manager.cc b/content/browser/frame_host/render_frame_host_manager.cc
index 58c17d54c34798e0e070878e4e572a594f41a3a3..7d15d53866f1140998b14c37528f03f075e76ef9 100644
--- a/content/browser/frame_host/render_frame_host_manager.cc
+++ b/content/browser/frame_host/render_frame_host_manager.cc
@@ -204,9 +204,7 @@ RenderFrameHostImpl* RenderFrameHostManager::Navigate(
                "FrameTreeNode id", frame_tree_node_->frame_tree_node_id());
   // Create a pending RenderFrameHost to use for the navigation.
   RenderFrameHostImpl* dest_render_frame_host = UpdateStateForNavigate(
-      dest_url,
-      // TODO(creis): Move source_site_instance to FNE.
-      entry.source_site_instance(), frame_entry.site_instance(),
+      dest_url, frame_entry.source_site_instance(), frame_entry.site_instance(),
       entry.GetTransitionType(),
       entry.restore_type() != NavigationEntryImpl::RESTORE_NONE,
       entry.IsViewSourceMode(), entry.transferred_global_request_id(),