Use native python bool for checkout_src_internal default value

Bug: 766263
Change-Id: I0c94cd2cf8062bf50b5cc7440c7335649bcdc4f7
Reviewed-on: https://chromium-review.googlesource.com/698164
Commit-Queue: Paweł Hajdan Jr. <[email protected]>
Reviewed-by: Aaron Gable <[email protected]>
Cr-Commit-Position: refs/heads/master@{#507362}
1 file changed