[webview_flutter] "Video playback policy Auto media playback" drive test failing often and blocking tree

This test fails seemingly pretty often and is currently blocking the tree. Seems like it's causing the device to die or something
```
00:53 +0: loading /b/s/w/ir/x/w/packages/packages/webview_flutter/webview_flutter/example/integration_test/webview_flutter_test.dart
...
01:01 +6: Video playback policy Auto media playback adb: device offline
adb uninstall failed: ProcessException: Process exited abnormally with exit code 1:
adb: device offline
Command: /b/s/w/ir/cache/android/sdk/platform-tools/adb -s emulator-5554 uninstall io.flutter.plugins.webviewflutterexample
```

https://ci.chromium.org/ui/p/flutter/builders/prod/Linux_android%20android_platform_tests_shard_6%20stable/1200/overview
https://ci.chromium.org/ui/p/flutter/builders/prod/Linux_android%20android_platform_tests_shard_6%20stable/1201/overview
https://ci.chromium.org/ui/p/flutter/builders/prod/Linux_android%20android_platform_tests_shard_6%20stable/1202/overview
https://ci.chromium.org/ui/p/flutter/builders/prod/Linux_android%20android_platform_tests_shard_6%20stable/1203/overview
https://ci.chromium.org/ui/p/flutter/builders/prod/Linux_android%20android_platform_tests_shard_6%20stable/1204/overview
https://ci.chromium.org/ui/p/flutter/builders/prod/Linux_android%20android_platform_tests_shard_6%20master/1199/overview
https://ci.chromium.org/ui/p/flutter/builders/prod/Linux_android%20android_platform_tests_shard_6%20master/1197/overview
https://ci.chromium.org/ui/p/flutter/builders/prod/Linux_android%20android_platform_tests_shard_6%20stable/1192/overview