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MemoryUma class reports 3 memory pressure related metrics, but there
are issues with them (see the bug), plus metrics are reported only for
the browser process.

We need memory pressure metrics for services too, in order to decide
best ways of handling low memory situations.

This CL deprecates the following metrics:

* MemoryAndroid.NotificationBackground
* MemoryAndroid.NotificationForeground
* MemoryAndroid.LowMemoryTimeBetween

and adds reporting of the following new metrics:

* Android.MemoryPressureNotification.Browser
* Android.MemoryPressureNotification.ChildService

Bug: 834529
Change-Id: If859958ce7adeeb6431f890dea2ffd7a3de8a4f1
Reviewed-on: https://chromium-review.googlesource.com/1013077
Commit-Queue: Dmitry Skiba <dskiba@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553658}