[perf] Disable unused chromium_builder_perf build targets.

BUILD.gn

 # Copyright (c) 2013 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 is the root build file for GN. GN will start processing by loading this
 # file, and recursively load all dependencies until all dependencies are either
 # resolved or known not to exist (which will cause the build to fail). So if
 # you add a new build file, there must be some path of dependencies from this
 # file to your new one or GN won't know about it.
 
@@ skipping 853 matching lines @@
 group("chromium_swarm_tests") {
 }
 
 group("chromium_builder_perf") {
   testonly = true
 
   if (!is_ios && !is_android && !is_chromecast) {
     deps = [
       "//cc:cc_perftests",
       "//chrome/test:load_library_perf_tests",
-      "//chrome/test:sync_performance_tests",
       "//gpu:gpu_perftests",
       "//media:media_perftests",
-      "//media/midi:midi_unittests",
       "//tools/perf/chrome_telemetry_build:telemetry_chrome_test",
     ]
 
     if (!is_chromeos) {
       deps += [ "//chrome/test:performance_browser_tests" ]
     }
     if (is_linux && !is_chromeos) {
       if (is_official_build) {
         # In GN builds, this is controlled by the 'linux_dump_symbols'
         # flag, which defaults to 1 for official builds. For now,
@@ skipping 103 matching lines @@
   assert(target_name != "")  # Mark as used.
   sources = invoker.actual_sources
   assert(
       sources == invoker.actual_sources,
       "Do not use a platform name in your output directory (found \"$root_build_dir\"). http://crbug.com/548283")
 }
 
 assert_valid_out_dir("_unused") {
   actual_sources = [ "$root_build_dir/foo" ]
 }