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Parameters |white_list| and |black_list| in FilterSourceFile()
take iterables of strings, and they don't have to be tuples.
Single-entry tuples are harder to read. The trailing comma could
be confusing, especially in a list of arguments.

They are converted to lists in this CL.

Bug: None
Change-Id: Iec5ed2f1e2d25bacf444165b734f76eaa3375aff
Reviewed-on: https://chromium-review.googlesource.com/1155708
Commit-Queue: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579576}