Memory Sheriff: Increase memory limit for prerendering during tests.
Memory Sheriff: Increase memory limit for prerendering during tests.

Memory usage may have creeped up again to hit the limit of 1G for
prerender tests. This increases the limit to 2G.

BUG=93076
TBR=davidben@chromium.org,cbentzel@chromium.org

Review URL: https://codereview.chromium.org/1683813003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#374533}

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