Complete the transition to unicode APIs on Windows.

runtime/bin/socket_win.cc

Index: runtime/bin/socket_win.cc
diff --git a/runtime/bin/socket_win.cc b/runtime/bin/socket_win.cc
index adc6aef87ae7026ad3dabfa9f11e29ee513644c3..fdefef2abbd9d1444f800b6d44510fb0cd3aacae 100644
--- a/runtime/bin/socket_win.cc
+++ b/runtime/bin/socket_win.cc
@@ -66,12 +66,14 @@ bool Socket::GetRemotePeer(intptr_t fd, char *host, intptr_t *port) {
   // Clear the port before calling WSAAddressToString as WSAAddressToString
   // includes the port in the formatted string.
   socket_address.sin_port = 0;
+  wchar_t* unicode_host = StringUtils::Utf8ToWide(host);
   DWORD len = INET_ADDRSTRLEN;
-  int err = WSAAddressToString(reinterpret_cast<LPSOCKADDR>(&socket_address),
-                               sizeof(socket_address),
-                               NULL,
-                               host,
-                               &len);
+  int err = WSAAddressToStringW(reinterpret_cast<LPSOCKADDR>(&socket_address),
+                                sizeof(socket_address),
+                                NULL,
+                                unicode_host,
+                                &len);
+  free(unicode_host);
   if (err != 0) {
     Log::PrintErr("Error WSAAddressToString: %d\n", WSAGetLastError());
     return false;
@@ -195,12 +197,14 @@ const char* Socket::LookupIPv4Address(char* host, OSError** os_error) {
 
   // Clear the port before calling WSAAddressToString as WSAAddressToString
   // includes the port in the formatted string.
+  wchar_t* unicode_buffer = StringUtils::Utf8ToWide(buffer);
   DWORD len = INET_ADDRSTRLEN;
-  int err = WSAAddressToString(reinterpret_cast<LPSOCKADDR>(sockaddr),
-                               sizeof(sockaddr_in),
-                               NULL,
-                               buffer,
-                               &len);
+  int err = WSAAddressToStringW(reinterpret_cast<LPSOCKADDR>(sockaddr),
+                                sizeof(sockaddr_in),
+                                NULL,
+                                unicode_buffer,
+                                &len);
+  free(unicode_buffer);
   if (err != 0) {
     free(buffer);
     return NULL;