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The current convention is to not send notification when the system exit
memory pressure, this isn't ideal as it doesn't let stateful listeners
know that they should stop their intervention.
This CL was uploaded by git cl split.

R=vmiura@chromium.org

Change-Id: I2c4a53b537d6bfa8391fadd8def543ba525558f9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2017047
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Auto-Submit: Sébastien Marchand <sebmarchand@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736424}