Revert "Better error-message when bind fails."

runtime/bin/socket_macos.cc

Index: runtime/bin/socket_macos.cc
diff --git a/runtime/bin/socket_macos.cc b/runtime/bin/socket_macos.cc
index 2e336a2003709fd5377c29f150d1f5b1a6aa7174..708cd3cdea9bd926079f611df3870980e8563d57 100644
--- a/runtime/bin/socket_macos.cc
+++ b/runtime/bin/socket_macos.cc
@@ -103,12 +103,6 @@ intptr_t Socket::CreateBindConnect(const RawAddr& addr,
 }
 
 
-bool Socket::IsBindError(intptr_t error_number) {
-  return error_number == EADDRINUSE || error_number == EADDRNOTAVAIL ||
-      error_number == EINVAL;
-}
-
-
 intptr_t Socket::Available(intptr_t fd) {
   return FDUtils::AvailableBytes(fd);
 }