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

ui/base/dragdrop/os_exchange_data_provider_win.cc

Index: ui/base/dragdrop/os_exchange_data_provider_win.cc
diff --git a/ui/base/dragdrop/os_exchange_data_provider_win.cc b/ui/base/dragdrop/os_exchange_data_provider_win.cc
index 47f1e0bb1d283fba3e89f6c7eebf7b3245721157..c09780fdf9e2ca5eceb72e40132bba5a00255096 100644
--- a/ui/base/dragdrop/os_exchange_data_provider_win.cc
+++ b/ui/base/dragdrop/os_exchange_data_provider_win.cc
@@ -12,6 +12,7 @@
 #include "base/i18n/file_util_icu.h"
 #include "base/logging.h"
 #include "base/macros.h"
+#include "base/memory/ptr_util.h"
 #include "base/pickle.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/win/scoped_hglobal.h"
@@ -276,8 +277,9 @@ OSExchangeDataProviderWin::OSExchangeDataProviderWin()
 OSExchangeDataProviderWin::~OSExchangeDataProviderWin() {
 }
 
-OSExchangeData::Provider* OSExchangeDataProviderWin::Clone() const {
-  return new OSExchangeDataProviderWin(data_object());
+std::unique_ptr<OSExchangeData::Provider>
+OSExchangeDataProviderWin::Clone() const {
+  return base::MakeUnique<OSExchangeDataProviderWin>(data_object());
 }
 
 void OSExchangeDataProviderWin::MarkOriginatedFromRenderer() {
@@ -1065,12 +1067,4 @@ static STGMEDIUM* GetStorageForFileDescriptor(
   return storage;
 }
 
-///////////////////////////////////////////////////////////////////////////////
-// OSExchangeData, public:
-
-// static
-OSExchangeData::Provider* OSExchangeData::CreateProvider() {
-  return new OSExchangeDataProviderWin();
-}
-
 }  // namespace ui