Remove src/trusted/manifest_name_service_proxy/ (old open_resource() impl)

src/BUILD.gn

 # Copyright (c) 2014 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 group("trusted_targets") {
   deps = [
     "//native_client/src/trusted/cpu_features:all_cpu_features",
     "//native_client/src/trusted/debug_stub:debug_stub",
     "//native_client/src/trusted/desc:nrd_xfer",
     "//native_client/src/trusted/validator/driver:ncval_new",
     "//native_client/src/trusted/validator/driver:elf_load",
     "//native_client/src/trusted/validator_ragel:rdfa_validator",
     "//native_client/src/trusted/service_runtime:sel",
     "//native_client/src/trusted/service_runtime:sel_main",
     "//native_client/src/trusted/service_runtime:env_cleanser",
     "//native_client/src/trusted/service_runtime:nacl_error_code",
     "//native_client/src/trusted/simple_service:simple_service",
     "//native_client/src/trusted/desc_cacheability:desc_cacheability",
-    "//native_client/src/trusted/manifest_name_service_proxy:manifest_proxy",
     "//native_client/src/trusted/threading:thread_interface",
     "//native_client/src/shared/srpc/:nonnacl_srpc",
     "//native_client/src/trusted/desc:nrd_xfer",
     "//native_client/src/trusted/perf_counter:nacl_perf_counter",
     "//native_client/src/trusted/nacl_base:nacl_base",
     "//native_client/src/shared/imc:imc",
     "//native_client/src/trusted/fault_injection:nacl_fault_inject",
     "//native_client/src/trusted/interval_multiset:nacl_interval",
     "//native_client/src/shared/platform:platform",
     "//native_client/src/trusted/platform_qualify:platform_qual_lib",
@@ skipping 10 matching lines @@
     "//native_client/src/shared/srpc:srpc",
     "//native_client/src/untrusted/nacl:imc_syscalls",
   ]
 }
 
 group("irt_targets") {
   deps = [
     "//native_client/src/untrusted/irt:irt_core",
   ]
 }