Fix object ownership in ui/base/models.

chrome/browser/android/bookmarks/partner_bookmarks_shim.cc

Index: chrome/browser/android/bookmarks/partner_bookmarks_shim.cc
diff --git a/chrome/browser/android/bookmarks/partner_bookmarks_shim.cc b/chrome/browser/android/bookmarks/partner_bookmarks_shim.cc
index e421d8af0195c304a32dd5f8386de0df25a23c81..7c095e45bd0595242347155bbf82fe527b65f392 100644
--- a/chrome/browser/android/bookmarks/partner_bookmarks_shim.cc
+++ b/chrome/browser/android/bookmarks/partner_bookmarks_shim.cc
@@ -175,9 +175,10 @@ const BookmarkNode* PartnerBookmarksShim::GetPartnerBookmarksRoot() const {
   return g_partner_model_keeper.Get().partner_bookmarks_root.get();
 }
 
-void PartnerBookmarksShim::SetPartnerBookmarksRoot(BookmarkNode* root_node) {
+void PartnerBookmarksShim::SetPartnerBookmarksRoot(
+    std::unique_ptr<bookmarks::BookmarkNode> root_node) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
-  g_partner_model_keeper.Get().partner_bookmarks_root.reset(root_node);
+  g_partner_model_keeper.Get().partner_bookmarks_root = std::move(root_node);
   g_partner_model_keeper.Get().loaded = true;
   FOR_EACH_OBSERVER(PartnerBookmarksShim::Observer, observers_,
                     PartnerShimLoaded(this));