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Apply git cl format to //tools/licenses.py.

//tools has its own custom styling configuration to use 2-space indent:
https://source.chromium.org/chromium/chromium/src/+/master:tools/.style.yapf?originalUrl=https:%2F%2Fcs.chromium.org%2F
So it is expected that this CL converts the file to use 2-space indent
even though it's not compatible with the latest style guide.

Change-Id: I5fd40493eba702f5ffcc5aa932841a509554c665
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2132649
Auto-Submit: Hiroshi Ichikawa <ichikawa@chromium.org>
Reviewed-by: David Jean <djean@chromium.org>
Commit-Queue: David Jean <djean@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756209}