Remove obsolete v8_benchmark. It was replaced with Octane on the perf bots.

chrome/chrome_tests.gypi

 # Copyright (c) 2012 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' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
       'common/pref_names.cc',
@@ skipping 1861 matching lines @@
         'test/perf/dom_checker_uitest.cc',
         'test/perf/feature_startup_test.cc',
         'test/perf/frame_rate/frame_rate_tests.cc',
         'test/perf/indexeddb_uitest.cc',
         'test/perf/memory_test.cc',
         'test/perf/page_cycler_test.cc',
         'test/perf/shutdown_test.cc',
         'test/perf/startup_test.cc',
         'test/perf/tab_switching_test.cc',
         'test/perf/url_fetch_test.cc',
-        'test/perf/v8_benchmark_uitest.cc',
       ],
       'conditions': [
         ['OS=="win" and buildtype=="Official"', {
           'configurations': {
             'Release': {
               'msvs_settings': {
                 'VCCLCompilerTool': {
                   'WholeProgramOptimization': 'false',
                 },
               },
@@ skipping 969 matching lines @@
             'sync_integration_tests.isolate',
           ],
           'sources': [
             'sync_integration_tests.isolate',
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }