After the engine->framework roll #159461 the framework tree has been closed on timeouts in platform view tests.

These were likely introduced by one of the 2 changes from @cbracken.

examples

• https://ci.chromium.org/ui/p/flutter/builders/prod/Mac_ios%20ios_platform_view_tests/19781/overview
• https://ci.chromium.org/ui/p/flutter/builders/prod/Mac_ios%20native_platform_view_ui_tests_ios/12973/overview