[cleanup] Use 'projectTypes' enum instead of string
[cleanup] Use 'projectTypes' enum instead of string

R=a72f38a79b5fac6811022b8a7fb84830d856c9c9@chromium.org

Bug: 1290254
Change-Id: I17dc97ca240bf5ffcdb97744b8f8683189b2aab2
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3423903
Auto-Submit: Simon Zünd <38944668e9e2ca98ccd0275b53370f90fa55c113@chromium.org>
Reviewed-by: Kim-Anh Tran <a72f38a79b5fac6811022b8a7fb84830d856c9c9@chromium.org>
Commit-Queue: Simon Zünd <38944668e9e2ca98ccd0275b53370f90fa55c113@chromium.org>

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