Cleanup: Remove src/trusted/gio/, since it is unused

src/trusted/service_runtime/BUILD.gn

 # Copyright (c) 2014 The Native ClientAuthors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 #  Generated from GYP
 
 static_library("sel_main") {
   sources = [
     "sel_main.c",
   ]
@@ skipping 215 matching lines @@
   sources = ["nacl_test_injection_main.c"]
   deps = [
     "//native_client/src/shared/gio:gio",
     "//native_client/src/shared/imc:imc",
     "//native_client/src/shared/platform:platform",
     "//native_client/src/shared/srpc/:nonnacl_srpc",
     "//native_client/src/trusted/debug_stub:debug_stub",
     "//native_client/src/trusted/desc:nrd_xfer",
     "//native_client/src/trusted/desc_cacheability:desc_cacheability",
     "//native_client/src/trusted/fault_injection:nacl_fault_inject",
-    "//native_client/src/trusted/gio:gio_wrapped_desc",
     "//native_client/src/trusted/interval_multiset:nacl_interval",
     "//native_client/src/trusted/manifest_name_service_proxy:manifest_proxy",
     "//native_client/src/trusted/nacl_base:nacl_base",
     "//native_client/src/trusted/perf_counter:nacl_perf_counter",
     "//native_client/src/trusted/platform_qualify:platform_qual_lib",
     "//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/threading:thread_interface",
     "//native_client/src/trusted/validator:validation_cache",
     "//native_client/src/trusted/validator:validators",
   ]
   if (is_posix) {
     libs = ["rt"]
     ldflags = ["-pie"]
   }
   if (is_linux) {
     datadeps = [
       "//native_client/src/trusted/service_runtime/linux:nacl_helper_bootstrap"
     ]
   }
 }