Change from PSS to RSS.

In practice, PSS and RSS should be the same for this test, but what
we are really measuring is RSS, so display it as such.

Bug: 138394907

Test: Ran memory_replay32/64 and verified that new RSS is the same as
Test: old version that used PSS.
Change-Id: Ida92e4551f5b58729cd699bc9a296d324483daae
3 files changed