This changes the base clipboard class.

webkit/glue/simple_clipboard_impl.cc

 // Copyright (c) 2006-2008 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 "webkit/glue/webkit_glue.h"
 
 #include <string>
 
 #include "base/clipboard.h"
 #include "base/lazy_instance.h"
@@ skipping 16 matching lines @@
 }
 
 namespace webkit_glue {
 
 base::LazyInstance<Clipboard> clipboard(base::LINKER_INITIALIZED);
 
 Clipboard* ClipboardGetClipboard() {
   return clipboard.Pointer();
 }
 
-bool ClipboardIsFormatAvailable(Clipboard::FormatType format) {
+bool ClipboardIsFormatAvailable(const Clipboard::FormatType& format) {
   return ClipboardGetClipboard()->IsFormatAvailable(format);
 }
 
 void ClipboardReadText(string16* result) {
   ClipboardGetClipboard()->ReadText(result);
 }
 
 void ClipboardReadAsciiText(std::string* result) {
   ClipboardGetClipboard()->ReadAsciiText(result);
 }
 
 void ClipboardReadHTML(string16* markup, GURL* url) {
   std::string url_str;
   ClipboardGetClipboard()->ReadHTML(markup, url ? &url_str : NULL);
   if (url)
     *url = GURL(url_str);
 }
 
 }  // namespace webkit_glue