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This was broken for a very long time and the initializers regressed.
There was a tool to update the perf_expectations.json file, but it
is either broken or has zero documentation. The perf team disavows
it. This is unmaintained, so I'm manually hacking this file to get
it to a state in which it works.

BUG=831951, 832854
NOTRY=true
NOPRESUBMIT=true
TBR=thakis@chromium.org

Change-Id: Idf1bd61d40540d0b85497e6669297fb54c2c2a28
Reviewed-on: https://chromium-review.googlesource.com/1012743
Commit-Queue: Avi Drissman <avi@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550723}