Switch engine.merge_method back to squash (#24319)
Switch engine.merge_method back to squash (#24319)

Unfortunately, device lab does not have the capacity for merge method
rebase. It's essentially DoSing device lab: The last engine rebase has
been processing for 6h now and it is still not done :(
flutter/flutter,cbracken/flutter,Hixie/flutter,tvolkert/flutter,flutter/flutter,cbracken/flutter,cbracken/flutter,tvolkert/flutter,cbracken/flutter,Hixie/flutter,cbracken/flutter,tvolkert/flutter,flutter/flutter,Hixie/flutter,cbracken/flutter,cbracken/flutter,Hixie/flutter,tvolkert/flutter,flutter/flutter,Hixie/flutter,Hixie/flutter,cbracken/flutter,cbracken/flutter,Hixie/flutter,flutter/flutter,tvolkert/flutter,tvolkert/flutter,tvolkert/flutter,tvolkert/flutter,flutter/flutter,cbracken/flutter,Hixie/flutter,Hixie/flutter,tvolkert/flutter,tvolkert/flutter,flutter/flutter,flutter/flutter,flutter/flutter,Hixie/flutter,flutter/flutter