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We need to rewrite to tbm2 in order to get memory. We don't really look
at memory metrics anyway at this point, so remove for now.

BUG=632295
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.perf:android_s5_perf_cq;master.tryserver.chromium.perf:linux_perf_cq;master.tryserver.chromium.perf:mac_retina_perf_cq;master.tryserver.chromium.perf:winx64_10_perf_cq

Review-Url: https://codereview.chromium.org/2325153002
Cr-Commit-Position: refs/heads/master@{#417603}