I see the following warning when linking the plugin now:

[2168/2171] LINK newlib_pnacl/remoting_client_plugin_newlib.pexe
/home/sergeyu/c/src/native_client/toolchain/linux_x86/pnacl_newlib/bin/le32-nacl-ld.gold: error: newlib_pnacl/obj/net/net/token_binding_openssl.o: multiple definition of 'net::IsTokenBindingSupported()'
/home/sergeyu/c/src/native_client/toolchain/linux_x86/pnacl_newlib/bin/le32-nacl-ld.gold: newlib_pnacl/obj/net/net/token_binding_nss.o: previous definition here
/home/sergeyu/c/src/native_client/toolchain/linux_x86/pnacl_newlib/bin/le32-nacl-ld.gold: error: newlib_pnacl/obj/net/net/token_binding_openssl.o: multiple definition of 'net::SignTokenBindingEkm(base::BasicStringPiece<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > >, crypto::ECPrivateKey*, std::__1::vector<unsigned char, std::__1::allocator<unsigned char> >*)'
/home/sergeyu/c/src/native_client/toolchain/linux_x86/pnacl_newlib/bin/le32-nacl-ld.gold: newlib_pnacl/obj/net/net/token_binding_nss.o: previous definition here
/home/sergeyu/c/src/native_client/toolchain/linux_x86/pnacl_newlib/bin/le32-nacl-ld.gold: error: newlib_pnacl/obj/net/net/token_binding_openssl.o: multiple definition of 'net::BuildTokenBindingMessageFromTokenBindings(std::__1::vector<base::BasicStringPiece<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > >, std::__1::allocator<base::BasicStringPiece<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > > > > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >*)'
/home/sergeyu/c/src/native_client/toolchain/linux_x86/pnacl_newlib/bin/le32-nacl-ld.gold: newlib_pnacl/obj/net/net/token_binding_nss.o: previous definition here
/home/sergeyu/c/src/native_client/toolchain/linux_x86/pnacl_newlib/bin/le32-nacl-ld.gold: error: newlib_pnacl/obj/net/net/token_binding_openssl.o: multiple definition of 'net::BuildProvidedTokenBinding(crypto::ECPrivateKey*, std::__1::vector<unsigned char, std::__1::allocator<unsigned char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >*)'
/home/sergeyu/c/src/native_client/toolchain/linux_x86/pnacl_newlib/bin/le32-nacl-ld.gold: newlib_pnacl/obj/net/net/token_binding_nss.o: previous definition here
/home/sergeyu/c/src/native_client/toolchain/linux_x86/pnacl_newlib/bin/le32-nacl-ld.gold: error: newlib_pnacl/obj/net/net/token_binding_openssl.o: multiple definition of 'net::ParseTokenBindingMessage(base::BasicStringPiece<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > >, base::BasicStringPiece<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > >*, base::BasicStringPiece<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > >*)'
/home/sergeyu/c/src/native_client/toolchain/linux_x86/pnacl_newlib/bin/le32-nacl-ld.gold: newlib_pnacl/obj/net/net/token_binding_nss.o: previous definition here
/home/sergeyu/c/src/native_client/toolchain/linux_x86/pnacl_newlib/bin/le32-nacl-ld.gold: error: newlib_pnacl/obj/net/net/token_binding_openssl.o: multiple definition of 'net::VerifyEKMSignature(base::BasicStringPiece<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > >, base::BasicStringPiece<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > >, base::BasicStringPiece<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > >)'
/home/sergeyu/c/src/native_client/toolchain/linux_x86/pnacl_newlib/bin/le32-nacl-ld.gold: newlib_pnacl/obj/net/net/token_binding_nss.o: previous definition here
[2171/2171] STAMP obj/remoting/webapp/webapp.stamp

The plugin still appears to be working.