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We will make UserLevelMemoryPressureSignal feature available on chrome desktop, because MemoryUsageMonitor is available on Linux, Windows and MacOS X now.
The feature is disabled-by-default and is enabled only on Android by using GCL. So this change doesn't enable the feature on chrome desktop.

Bug: 920922
Change-Id: Idbcdef6693ea3956a3f010065f5d21c5fb4594cc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2015474Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Commit-Queue: Takashi Sakamoto <tasak@google.com>
Cr-Commit-Position: refs/heads/master@{#735312}