[Fuzz] update download_fuzz_corpora.py to accept corpora type

This is a non functional change to prepare changes in fuzz.py.

Centipede and libfuzzer will share the same set of scripts, and when
necessary distinguished by comand line args or builder properties.

Bug: 394107968
Change-Id: I2c55aea46b03e90d7b546415c0c84237b8cca7b6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6226661
Commit-Queue: Weizhong Xia <[email protected]>
Reviewed-by: Prakhar Asthana <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1416501}
NOKEYCHECK=True
GitOrigin-RevId: cfcaa44c33435b2ab9e4d9e4812cbb16d326331e
2 files changed