Remove audio_unittests from GPU bots.

Unfortunately, the project to run these on physical hardware on
Swarming didn't make it over the finish line. After offline discussion
with the media team, the GPU FYI waterfall will no longer run these
tests, though we could reconsider doing so in the future.

Note that this CL also removes audio_unittests' isolate from
gn_isolate_map.pyl, since the GPU bots were the only bots running
these tests on any of Chromium's waterfalls.

BUG=416594, 574942
NOTRY=true

Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I49a22a84cface1e1a1b5990dd9c3ef403d09a39f
Reviewed-on: https://chromium-review.googlesource.com/808091
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521756}

content/test/gpu/generate_buildbot_json.py

@@ -1423,38 +1423,6 @@ COMMON_GTESTS = {
     ],
     'linux_args': [ '--no-xvfb' ]
   },
-  # Until the media-only tests are extracted from content_unittests,
-  # and audio_unittests and content_unittests can be run on the commit
-  # queue with --require-audio-hardware-for-testing, run them only on
-  # the FYI waterfall.
-  #
-  # Note that the transition to the Chromium recipe has forced the
-  # removal of the --require-audio-hardware-for-testing flag for the
-  # time being. See crbug.com/574942.
-  'audio_unittests': {
-    'tester_configs': [
-      {
-        'predicate': Predicates.FYI_AND_OPTIONAL,
-      }
-    ],
-    # Don't run these tests on Android.
-    'disabled_tester_configs': [
-      {
-        'names': [
-          'Linux Ozone (Intel)',
-        ],
-      },
-      {
-        'os_types': ['android'],
-      },
-    ],
-    'args': ['--use-gpu-in-tests']
-  },
-  # TODO(kbr): content_unittests is killing the Linux GPU swarming
-  # bots. crbug.com/582094 . It's not useful now anyway until audio
-  # hardware is deployed on the swarming bots, so stop running it
-  # everywhere.
-  # 'content_unittests': {},
   'gl_tests': {
     'disabled_tester_configs': [
       {

testing/buildbot/gn_isolate_map.pyl

@@ -139,11 +139,6 @@
     "label": "//ash:ash_unittests",
     "type": "windowed_test_launcher",
   },
-  "audio_unittests": {
-    "label": "//media:audio_unittests",
-    "type": "raw",
-    "args": [],
-  },
   "aura_unittests": {
     "label": "//ui/aura:aura_unittests",
     "type": "windowed_test_launcher",