[CodeHealth] Migrate multiple python unit tests to Python3

Bug: 1223892
Change-Id: I72d8a2acbd7d47eb85a1fdcf461b374f79eea342
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3065476
Reviewed-by: Dirk Pranke <dpranke@google.com>
Commit-Queue: Victor Vianna <victorvianna@google.com>
Cr-Commit-Position: refs/heads/main@{#917178}
NOKEYCHECK=True
GitOrigin-RevId: 02442ef0cb33cdbf2c38a70f2ea10263c5f81204
4 files changed
tree: 658af902ebf7f2d93b14237703c2e7f64c860f6f
  1. development/
  2. DIR_METADATA
  3. LICENSE
  4. OWNERS
  5. README.chromium