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The actual filenames are all lowercase, but src attributes in
execorder.html contains uppercase letters. This causes the scripts not
found and thus timeouts on Linux (which runs on a case-sensitive
filesystem).

This CL fixes the timeout by making the src attributes all lowercased.

BUG=594639

Review-Url: https://codereview.chromium.org/2856053005
Cr-Commit-Position: refs/heads/master@{#469519}