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Refactor WebMClusterParserTest parser creation for readability

This change adds some helpers to help readability of these tests,
addressing a review comment from
https://codereview.chromium.org/1235793005/.
It also moves some test statics into an unnamed namespace for style.

R=xhwang@chromium.org

Review URL: https://codereview.chromium.org/1242943003

Cr-Commit-Position: refs/heads/master@{#339750}