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

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 60486709d1c9b4d33b3221205d19d010131681a2..a0f13fa6e39945c614d2e43762996de87b024900 100644
--- a/ui/base/dragdrop/os_exchange_data_provider_aurax11.cc
+++ b/ui/base/dragdrop/os_exchange_data_provider_aurax11.cc
@@ -107,8 +107,10 @@ SelectionFormatMap OSExchangeDataProviderAuraX11::GetFormatMap() const {
   return selection_owner_.selection_format_map();
 }
 
-OSExchangeData::Provider* OSExchangeDataProviderAuraX11::Clone() const {
-  OSExchangeDataProviderAuraX11* ret = new OSExchangeDataProviderAuraX11();
+std::unique_ptr<OSExchangeData::Provider>
+OSExchangeDataProviderAuraX11::Clone() const {
+  std::unique_ptr<OSExchangeDataProviderAuraX11> ret(
+      new OSExchangeDataProviderAuraX11());
   ret->format_map_ = format_map_;
   return ret;
 }
@@ -543,12 +545,4 @@ std::vector< ::Atom> OSExchangeDataProviderAuraX11::GetTargets() const {
   return format_map_.GetTypes();
 }
 
-///////////////////////////////////////////////////////////////////////////////
-// OSExchangeData, public:
-
-// static
-OSExchangeData::Provider* OSExchangeData::CreateProvider() {
-  return new OSExchangeDataProviderAuraX11();
-}
-
 }  // namespace ui