Have BuildStats use Flutter's stripped lib

That's what their treemap says and we should try to match it.

Bug: skia:
Change-Id: Iefa95c0440eb6b45a94a72c1beffb8a1199152a4
Reviewed-on: https://skia-review.googlesource.com/c/161825
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
9 files changed