[Refactor] Rename DnsResolutionObserver --> HostResolver::Observer....

net/net.gyp

 # Copyright (c) 2009 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     '../build/common.gypi',
@@ skipping 43 matching lines @@
         'base/connection_type_histograms.cc',
         'base/connection_type_histograms.h',
         'base/cookie_monster.cc',
         'base/cookie_monster.h',
         'base/cookie_policy.cc',
         'base/cookie_policy.h',
         'base/data_url.cc',
         'base/data_url.h',
         'base/directory_lister.cc',
         'base/directory_lister.h',
-        'base/dns_resolution_observer.h',
         'base/effective_tld_names.cc',
         'base/effective_tld_names.dat',
         'base/escape.cc',
         'base/escape.h',
         'base/ev_root_ca_metadata.cc',
         'base/ev_root_ca_metadata.h',
         'base/file_stream.h',
         'base/file_stream_posix.cc',
         'base/file_stream_win.cc',
         'base/filter.cc',
@@ skipping 594 matching lines @@
             'tools/fetch/http_server.cc',
             'tools/fetch/http_server.h',
             'tools/fetch/http_session.cc',
             'tools/fetch/http_session.h',
           ],
         },
       ],
     }],
   ],
 }