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

ui/base/dragdrop/os_exchange_data_provider_mac.mm

 // Copyright 2014 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_mac.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
@@ skipping 194 matching lines @@
 // static
 NSArray* OSExchangeDataProviderMac::SupportedPasteboardTypes() {
   return @[
     kWebCustomDataPboardType, ui::ClipboardUtil::UTIForWebURLsAndTitles(),
     NSURLPboardType, NSFilenamesPboardType, ui::kChromeDragDummyPboardType,
     NSStringPboardType, NSHTMLPboardType, NSRTFPboardType,
     NSFilenamesPboardType, ui::kWebCustomDataPboardType, NSPasteboardTypeString
   ];
 }
 
-///////////////////////////////////////////////////////////////////////////////
-// OSExchangeData, public:
-
-// static
-OSExchangeData::Provider* OSExchangeData::CreateProvider() {
-  return new OSExchangeDataProviderMac;
-}
-
 }  // namespace ui