Revert of WebRTC: Enable OpenH264 for WebRTC standalone bots.

scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_linux_ubsan_vptr.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/bot_update.py",
       "--master",
       "tryserver.webrtc",
       "--builder",
       "linux_ubsan_vptr",
@@ skipping 64 matching lines @@
   },
   {
     "cmd": [
       "python",
       "-u",
       "[DEPOT_TOOLS]/gclient.py",
       "runhooks"
     ],
     "cwd": "[SLAVE_BUILD]",
     "env": {
-      "GYP_DEFINES": "clang=1 component=static_library dcheck_always_on=1 fastbuild=1 ffmpeg_branding=Chrome gomadir='[BUILD]/goma' release_extra_cflags=-fno-sanitize-recover=undefined target_arch=x64 ubsan_vptr=1 use_goma=1 use_openh264=1 use_third_party_h264=1"
+      "GYP_DEFINES": "clang=1 component=static_library dcheck_always_on=1 fastbuild=1 gomadir='[BUILD]/goma' release_extra_cflags=-fno-sanitize-recover=undefined target_arch=x64 ubsan_vptr=1 use_goma=1"
     },
     "name": "gclient runhooks"
   },
   {
     "allow_subannotations": true,
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/clang_revision.py",
       "--src-dir",
@@ skipping 412 matching lines @@
     ],
     "cwd": "[SLAVE_BUILD]",
     "name": "webrtc_nonparallel_tests"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]