Make SharedMemoryHandle a class on windows.

ipc/handle_win.cc

 // Copyright 2015 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 "ipc/handle_win.h"
 
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/strings/string_number_conversions.h"
 #include "ipc/handle_attachment_win.h"
 
 namespace IPC {
 
+HandleWin::HandleWin() : handle_(nullptr), permissions_(INVALID) {}
 HandleWin::HandleWin(const HANDLE& handle, Permissions permissions)
     : handle_(handle), permissions_(permissions) {}
 
 // static
 void ParamTraits<HandleWin>::Write(Message* m, const param_type& p) {
   scoped_refptr<IPC::internal::HandleAttachmentWin> attachment(
       new IPC::internal::HandleAttachmentWin(p.get_handle(),
                                              p.get_permissions()));
   if (!m->WriteAttachment(attachment.Pass()))
     NOTREACHED();
@@ skipping 20 matching lines @@
   return true;
 }
 
 // static
 void ParamTraits<HandleWin>::Log(const param_type& p, std::string* l) {
   l->append(base::StringPrintf("0x%X", p.get_handle()));
   l->append(base::IntToString(p.get_permissions()));
 }
 
 }  // namespace IPC