Tune down V8 for proxy auto config
Tune down V8 for proxy auto config

The PAC performance is constrained mainly by DNS resolution time, so we
optimize for memory usage only.

BUG=544232
R=verwaest@chromium.org,eroman@chromium.org

Review URL: https://codereview.chromium.org/1577213004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#369714}

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