(gcc) fix compilation of os_exchange_data_provider_aurax11.cc

ui/base/dragdrop/os_exchange_data_provider_aurax11.cc

Index: ui/base/dragdrop/os_exchange_data_provider_aurax11.cc
diff --git a/ui/base/dragdrop/os_exchange_data_provider_aurax11.cc b/ui/base/dragdrop/os_exchange_data_provider_aurax11.cc
index a0f13fa6e39945c614d2e43762996de87b024900..9b93593dc2e413f5d22d50995a5fac0fb5e977f8 100644
--- a/ui/base/dragdrop/os_exchange_data_provider_aurax11.cc
+++ b/ui/base/dragdrop/os_exchange_data_provider_aurax11.cc
@@ -4,6 +4,8 @@
 
 #include "ui/base/dragdrop/os_exchange_data_provider_aurax11.h"
 
+#include <utility>
+
 #include "base/logging.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/strings/string_split.h"
@@ -112,7 +114,7 @@ OSExchangeDataProviderAuraX11::Clone() const {
   std::unique_ptr<OSExchangeDataProviderAuraX11> ret(
       new OSExchangeDataProviderAuraX11());
   ret->format_map_ = format_map_;
-  return ret;
+  return std::move(ret);
 }
 
 void OSExchangeDataProviderAuraX11::MarkOriginatedFromRenderer() {