Revert "Roll engine 0e8ed2715a35..e0ebaea59071 (31 commits) (#… (#50736)
Revert "Roll engine 0e8ed2715a35..e0ebaea59071 (31 commits) (#… (#50736)

This reverts commit 8b08120404b1ce9c678c91a4dfa3713a3baacbcf to see if it is the cause of the coverage OOM kills.

Merging on red to try and fix the build.
flutter/flutter,cbracken/flutter,tvolkert/flutter,flutter/flutter,Hixie/flutter,Hixie/flutter,flutter/flutter,flutter/flutter,cbracken/flutter,flutter/flutter,cbracken/flutter,tvolkert/flutter,tvolkert/flutter,Hixie/flutter,Hixie/flutter,cbracken/flutter,flutter/flutter,tvolkert/flutter,tvolkert/flutter,cbracken/flutter,Hixie/flutter,tvolkert/flutter,Hixie/flutter,cbracken/flutter,cbracken/flutter,flutter/flutter,Hixie/flutter,tvolkert/flutter,tvolkert/flutter,Hixie/flutter,flutter/flutter,Hixie/flutter,cbracken/flutter,flutter/flutter,cbracken/flutter,tvolkert/flutter,flutter/flutter,cbracken/flutter,tvolkert/flutter,Hixie/flutter