Remove unused HostResolver::Observer.

net/net.gyp

 # Copyright (c) 2011 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,
 
     'linux_link_kerberos%': 0,
     'conditions': [
@@ skipping 1294 matching lines @@
         'tools/testserver/run_testserver.cc',
       ],
     },
     {
       'target_name': 'net_test_support',
       'type': 'static_library',
       'dependencies': [
         'net',
         '../base/base.gyp:base',
         '../base/base.gyp:test_support_base',
-        '../build/temp_gyp/googleurl.gyp:googleurl',
         '../testing/gtest.gyp:gtest',
       ],
       'sources': [
         'base/cert_test_util.cc',
         'base/cert_test_util.h',
         'base/cookie_monster_store_test.cc',
         'base/cookie_monster_store_test.h',
         'base/cookie_store_test_helpers.cc',
         'base/cookie_store_test_helpers.h',
         'base/mock_file_stream.cc',
         'base/mock_file_stream.h',
         'base/mock_host_resolver.cc',
         'base/mock_host_resolver.h',
         'base/net_test_suite.cc',
         'base/net_test_suite.h',
         'base/test_completion_callback.cc',
         'base/test_completion_callback.h',
-        'base/test_host_resolver_observer.cc',
-        'base/test_host_resolver_observer.h',
         'disk_cache/disk_cache_test_util.cc',
         'disk_cache/disk_cache_test_util.h',
         'dns/dns_test_util.cc',
         'dns/dns_test_util.h',
         'proxy/mock_proxy_resolver.cc',
         'proxy/mock_proxy_resolver.h',
         'proxy/mock_proxy_script_fetcher.cc',
         'proxy/mock_proxy_script_fetcher.h',
         'proxy/proxy_config_service_common_unittest.cc',
         'proxy/proxy_config_service_common_unittest.h',
@@ skipping 289 matching lines @@
             'tools/dump_cache/url_to_filename_encoder.cc',
             'tools/dump_cache/url_to_filename_encoder.h',
             'tools/dump_cache/url_utilities.h',
             'tools/dump_cache/url_utilities.cc',
           ],
         },
       ],
     }],
   ],
 }