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Collecting the metrics was sometimes causing a crash and has been removed
until the root cause is found.
This is only a partial revert because items are not to be removed from
tools/metrics/histograms/histograms.xml.

BUG=474702

Review URL: https://codereview.chromium.org/1070693002

Cr-Commit-Position: refs/heads/master@{#324226}