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

ui/base/dragdrop/os_exchange_data_provider_aura.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_aura.h"
 
 #include "base/logging.h"
+#include "base/memory/ptr_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "net/base/filename_util.h"
 #include "ui/base/clipboard/clipboard.h"
 #include "ui/base/clipboard/scoped_clipboard_writer.h"
 #include "ui/base/dragdrop/file_info.h"
 
 namespace ui {
 
 OSExchangeDataProviderAura::OSExchangeDataProviderAura()
     : formats_(0) {
 }
 
 OSExchangeDataProviderAura::~OSExchangeDataProviderAura() {}
 
-OSExchangeData::Provider* OSExchangeDataProviderAura::Clone() const {
+std::unique_ptr<OSExchangeData::Provider>
+OSExchangeDataProviderAura::Clone() const {
   OSExchangeDataProviderAura* ret = new OSExchangeDataProviderAura();
   ret->formats_ = formats_;
   ret->string_ = string_;
   ret->url_ = url_;
   ret->title_ = title_;
   ret->filenames_ = filenames_;
   ret->pickle_data_ = pickle_data_;
   // We skip copying the drag images.
   ret->html_ = html_;
   ret->base_url_ = base_url_;
 
-  return ret;
+  return base::WrapUnique<OSExchangeData::Provider>(ret);
 }
 
 void OSExchangeDataProviderAura::MarkOriginatedFromRenderer() {
   // TODO(dcheng): Currently unneeded because ChromeOS Aura correctly separates
   // URL and filename metadata, and does not implement the DownloadURL protocol.
 }
 
 bool OSExchangeDataProviderAura::DidOriginateFromRenderer() const {
   return false;
 }
@@ skipping 165 matching lines @@
 
   GURL test_url(string_);
   if (!test_url.is_valid())
     return false;
 
   if (url)
     *url = test_url;
   return true;
 }
 
-///////////////////////////////////////////////////////////////////////////////
-// OSExchangeData, public:
-
-// static
-OSExchangeData::Provider* OSExchangeData::CreateProvider() {
-  return new OSExchangeDataProviderAura();
-}
-
 }  // namespace ui