Allow OSExchangeData::Provider to be overridden at run time.

components/bookmarks/browser/bookmark_node_data_unittest.cc

Index: components/bookmarks/browser/bookmark_node_data_unittest.cc
diff --git a/components/bookmarks/browser/bookmark_node_data_unittest.cc b/components/bookmarks/browser/bookmark_node_data_unittest.cc
index 24bd39a4537026387c65307fbd2b02a90443c38e..650a293d0f7955909a045baae9fb769ff683f4be 100644
--- a/components/bookmarks/browser/bookmark_node_data_unittest.cc
+++ b/components/bookmarks/browser/bookmark_node_data_unittest.cc
@@ -62,7 +62,8 @@ class BookmarkNodeDataTest : public testing::Test {
 
 namespace {
 
-ui::OSExchangeData::Provider* CloneProvider(const ui::OSExchangeData& data) {
+std::unique_ptr<ui::OSExchangeData::Provider> CloneProvider(
+    const ui::OSExchangeData& data) {
   return data.provider().Clone();
 }