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THis also fix the regex of finding .wpr files in json archives list

Bug: 730036
Change-Id: Iea0d1cd53caa4a45d293940a345dfa9e66737e63
Reviewed-on: https://chromium-review.googlesource.com/596589
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Reviewed-by: Helen Li <xunjieli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491212}