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

ui/base/dragdrop/os_exchange_data_provider_aurax11.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/base/dragdrop/os_exchange_data_provider_aurax11.h"
 
 #include "base/logging.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
@@ skipping 89 matching lines @@
     std::vector<Atom>* targets) const {
   selection_owner_.RetrieveTargets(targets);
 }
 
 SelectionFormatMap OSExchangeDataProviderAuraX11::GetFormatMap() const {
   // We return the |selection_owner_|'s format map instead of our own in case
   // ours has been modified since TakeOwnershipOfSelection() was called.
   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;
 }
 
 void OSExchangeDataProviderAuraX11::MarkOriginatedFromRenderer() {
   std::string empty;
   format_map_.Insert(atom_cache_.GetAtom(kRendererTaint),
                      scoped_refptr<base::RefCountedMemory>(
                          base::RefCountedString::TakeString(&empty)));
 }
@@ skipping 414 matching lines @@
     }
   }
 
   return false;
 }
 
 std::vector< ::Atom> OSExchangeDataProviderAuraX11::GetTargets() const {
   return format_map_.GetTypes();
 }
 
-///////////////////////////////////////////////////////////////////////////////
-// OSExchangeData, public:
-
-// static
-OSExchangeData::Provider* OSExchangeData::CreateProvider() {
-  return new OSExchangeDataProviderAuraX11();
-}
-
 }  // namespace ui