Skip COFF timestamp difference.

Current deps diffs shows lots of files differs only first certain bytes on Windows.  They are COFF timestamp difference, and we do not usually need to check.  Let me skip showing them.

BUG=314403

Review-Url: https://codereview.chromium.org/2303063003
Cr-Commit-Position: refs/heads/master@{#417179}
1 file changed