Remove SingleHostResolver completely.

net/net.gypi

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This file is shared between the regular GYP build, the NaCl GYP build, and
 # the GN build. For GN support, it must have no conditionals or anything like
 # that beyond the simple one-level-deep dictionary of values.
 {
   'variables': {
     # Subset of net source files that are compiled for NaCl (net_nacl target).
@@ skipping 605 matching lines @@
       'dns/mdns_client_impl.cc',
       'dns/mdns_client_impl.h',
       'dns/notify_watcher_mac.cc',
       'dns/notify_watcher_mac.h',
       'dns/record_parsed.cc',
       'dns/record_parsed.h',
       'dns/record_rdata.cc',
       'dns/record_rdata.h',
       'dns/serial_worker.cc',
       'dns/serial_worker.h',
-      'dns/single_request_host_resolver.cc',
-      'dns/single_request_host_resolver.h',
       'filter/filter.cc',
       'filter/filter.h',
       'filter/gzip_filter.cc',
       'filter/gzip_filter.h',
       'filter/gzip_header.cc',
       'filter/gzip_header.h',
       'filter/sdch_filter.cc',
       'filter/sdch_filter.h',
       'http/bidirectional_stream.cc',
       'http/bidirectional_stream.h',
@@ skipping 841 matching lines @@
       'dns/host_cache_unittest.cc',
       'dns/host_resolver_impl_unittest.cc',
       'dns/host_resolver_mojo_unittest.cc',
       'dns/mapped_host_resolver_unittest.cc',
       'dns/mdns_cache_unittest.cc',
       'dns/mdns_client_unittest.cc',
       'dns/mojo_host_resolver_impl_unittest.cc',
       'dns/record_parsed_unittest.cc',
       'dns/record_rdata_unittest.cc',
       'dns/serial_worker_unittest.cc',
-      'dns/single_request_host_resolver_unittest.cc',
       'extras/sqlite/sqlite_channel_id_store_unittest.cc',
       'extras/sqlite/sqlite_persistent_cookie_store_unittest.cc',
       'filter/brotli_filter_unittest.cc',
       'filter/filter_unittest.cc',
       'filter/gzip_filter_unittest.cc',
       'filter/mock_filter_context.cc',
       'filter/mock_filter_context.h',
       'filter/sdch_filter_unittest.cc',
       'ftp/ftp_auth_cache_unittest.cc',
       'ftp/ftp_ctrl_response_buffer_unittest.cc',
@@ skipping 1692 matching lines @@
       'third_party/nist-pkits/crls/requireExplicitPolicy5subCACRL.crl',
       'third_party/nist-pkits/crls/requireExplicitPolicy5subsubCACRL.crl',
       'third_party/nist-pkits/crls/requireExplicitPolicy5subsubsubCACRL.crl',
       'third_party/nist-pkits/crls/requireExplicitPolicy7CACRL.crl',
       'third_party/nist-pkits/crls/requireExplicitPolicy7subCARE2CRL.crl',
       'third_party/nist-pkits/crls/requireExplicitPolicy7subsubCARE2RE4CRL.crl',
       'third_party/nist-pkits/crls/requireExplicitPolicy7subsubsubCARE2RE4CRL.crl',
     ],
   }
 }