Rewrite clipboard write IPC handling to be easier to understand.

ui/base/clipboard/clipboard_util_win.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/clipboard/clipboard_util_win.h"
 
 #include <shellapi.h>
 #include <shlwapi.h>
 #include <wininet.h>  // For INTERNET_MAX_URL_LENGTH.
 
 #include "base/basictypes.h"
+#include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/win/scoped_hglobal.h"
 #include "net/base/filename_util.h"
 #include "ui/base/clipboard/clipboard.h"
 #include "ui/base/clipboard/custom_data_helper.h"
 #include "url/gurl.h"
@@ skipping 471 matching lines @@
           end_fragment_start + end_fragment_str.length()));
     }
   } else {
     *fragment_start = cf_html.find('>', tag_start) + 1;
     size_t tag_end = cf_html.rfind("<!--EndFragment", std::string::npos);
     *fragment_end = cf_html.rfind('<', tag_end);
   }
 }
 
 }  // namespace ui