Have ScopedClipboardWriter and Clipboard::WriteObjects take a buffer parameter.

ui/base/clipboard/clipboard_mac.mm

 // 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/clipboard/clipboard.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/basictypes.h"
 #include "base/file_path.h"
@@ skipping 66 matching lines @@
     const std::string& serialization) {
   return FormatType(base::SysUTF8ToNSString(serialization));
 }
 
 Clipboard::Clipboard() {
 }
 
 Clipboard::~Clipboard() {
 }
 
-void Clipboard::WriteObjects(const ObjectMap& objects) {
+void Clipboard::WriteObjects(Buffer buffer, const ObjectMap& objects) {
+  DCHECK_EQ(buffer, BUFFER_STANDARD);
+
   NSPasteboard* pb = GetPasteboard();
   [pb declareTypes:[NSArray array] owner:nil];
 
   for (ObjectMap::const_iterator iter = objects.begin();
        iter != objects.end(); ++iter) {
     DispatchObject(static_cast<ObjectType>(iter->first), iter->second);
   }
 }
 
 void Clipboard::WriteText(const char* text_data, size_t text_len) {
@@ skipping 329 matching lines @@
   return type;
 }
 
 // static
 const Clipboard::FormatType& Clipboard::GetWebCustomDataFormatType() {
   CR_DEFINE_STATIC_LOCAL(FormatType, type, (kWebCustomDataPboardType));
   return type;
 }
 
 }  // namespace ui