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It used to use runtimeStatsMetric but this seems broken, so move to
runtimeStatsTotalMetric instead.

Perf Sheriffs: This is expected to change all the metrics on
v8.runtime_stats.top_25 due to the change in measurements.

BUG=chromium:688342

Change-Id: I3e185fa9086e69151f4c5fa2db5fbf3d326d93fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1771611Reviewed-by: Juan Antonio Navarro Pérez <perezju@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#691081}