Add an upload presubmit rule to catch disallowed use of Chromium namespaces.
Add an upload presubmit rule to catch disallowed use of Chromium namespaces.

These namespaces and classes may soon be linked into Blink's core (via platform
and/or WTF), but they are not intended to be used within Blink's engine.

This rule should catch most inadvertent cases of this, and #include is already
checked by check-blink-deps.

TESTED=manually

Review URL: https://codereview.chromium.org/1453743002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#360165}

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