Fix NamedProxyLauncher on Windows.

ipc/ipc_channel_posix.cc

 // Copyright (c) 2011 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/ipc_channel_posix.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <stddef.h>
 #include <sys/types.h>
@@ skipping 975 matching lines @@
 
   // Close any outstanding, received file descriptors.
   for (std::vector<int>::iterator
        i = input_overflow_fds_.begin(); i != input_overflow_fds_.end(); ++i) {
     if (HANDLE_EINTR(close(*i)) < 0)
       PLOG(ERROR) << "close";
   }
   input_overflow_fds_.clear();
 }
 
+// static
+bool Channel::ChannelImpl::IsNamedServerInitialized(
+    const std::string& channel_id) {
+  return file_util::PathExists(FilePath(channel_id));
+}
+
 // Called by libevent when we can read from the pipe without blocking.
 void Channel::ChannelImpl::OnFileCanReadWithoutBlocking(int fd) {
   bool send_server_hello_msg = false;
   if (fd == server_listen_pipe_) {
     int new_pipe = 0;
     if (!ServerAcceptConnection(server_listen_pipe_, &new_pipe)) {
       Close();
       listener_->OnChannelListenError();
     }
 
@@ skipping 189 matching lines @@
 }
 
 bool Channel::GetClientEuid(uid_t* client_euid) const {
   return channel_impl_->GetClientEuid(client_euid);
 }
 
 void Channel::ResetToAcceptingConnectionState() {
   channel_impl_->ResetToAcceptingConnectionState();
 }
 
+// static
+bool Channel::IsNamedServerInitialized(const std::string& channel_id) {
+  return ChannelImpl::IsNamedServerInitialized(channel_id);
+}
+
 }  // namespace IPC