WebRTC: Remove android_apk recipe

scripts/slave/recipes/webrtc/chromium.expected/chromium_webrtc_Mac_Tester.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/bot_update.py",
       "--master",
       "chromium.webrtc",
       "--builder",
       "Mac Tester",
@@ skipping 81 matching lines @@
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/extract_build.py",
       "--target",
       "Release",
       "--build-url",
       "gs://chromium-webrtc/Mac Builder",
       "--build_revision",
-      "170242",
+      "321321",
       "--factory-properties",
       "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"buildername\": \"Mac Tester\", \"buildnumber\": 571, \"mastername\": \"chromium.webrtc\", \"parent_buildername\": \"Mac Builder\", \"parent_got_revision\": \"321321\", \"recipe\": \"webrtc/chromium\", \"revision\": \"321321\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}",
       "--build-properties",
       "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"buildername\": \"Mac Tester\", \"buildnumber\": 571, \"mastername\": \"chromium.webrtc\", \"parent_buildername\": \"Mac Builder\", \"parent_got_revision\": \"321321\", \"recipe\": \"webrtc/chromium\", \"revision\": \"321321\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}"
     ],
     "name": "extract build"
   },
   {
     "cmd": [
       "python",
@@ skipping 78 matching lines @@
       "--test-type=content_unittests",
       "--builder-name=Mac Tester",
       "--slave-name=TestSlavename",
       "--build-number=571",
       "content_unittests",
       "--gtest_filter=WebRtc*:WebRTC*:RTC*:MediaStream*"
     ],
     "name": "content_unittests"
   }
 ]