Fix NamedProxyLauncher on Windows.

ipc/ipc_channel_win.cc

Index: ipc/ipc_channel_win.cc
diff --git a/ipc/ipc_channel_win.cc b/ipc/ipc_channel_win.cc
index e56235da3d16fba598bfdc56375b8373e2f66955..3a85a1651fb40b7750dbfa3e7a010c0c21938f8d 100644
--- a/ipc/ipc_channel_win.cc
+++ b/ipc/ipc_channel_win.cc
@@ -93,8 +93,19 @@ bool Channel::ChannelImpl::Send(Message* message) {
   return true;
 }
 
+// static
+bool Channel::ChannelImpl::IsNamedServerInitialized(
+    const std::string& channel_id) {
+  if (WaitNamedPipe(PipeName(channel_id).c_str(), 1))
+    return true;
+  // If ERROR_SEM_TIMEOUT occurred, the pipe exists but is handling another
+  // connection.
+  return GetLastError() == ERROR_SEM_TIMEOUT;
+}
+
+// static
 const std::wstring Channel::ChannelImpl::PipeName(
-    const std::string& channel_id) const {
+    const std::string& channel_id) {
   std::string name("\\\\.\\pipe\\chrome.");
   return ASCIIToWide(name.append(channel_id));
 }
@@ -411,4 +422,9 @@ bool Channel::Send(Message* message) {
   return channel_impl_->Send(message);
 }
 
+// static
+bool Channel::IsNamedServerInitialized(const std::string& channel_id) {
+  return ChannelImpl::IsNamedServerInitialized(channel_id);
+}
+
 }  // namespace IPC