The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b27715713a58846b2cdde9c7b94b9bfbb585ecf3

commit b27715713a58846b2cdde9c7b94b9bfbb585ecf3
Author: Matthew Cary <mattcary@chromium.org>
Date: Tue Jul 31 08:49:57 2018

Orderfile: remove unused stability calculations.

Since we are now creating orderfiles by running across multiple
benchmarks, the stability computations don't make much sense as, for
example, we don't expect the startup symbols from two different
benchmarks to necessarily be similar.

Bug:  865983 
Change-Id: I11f756a69bf160e9dce293e3c1cd05003264da0f
Reviewed-on: https://chromium-review.googlesource.com/1152739
Reviewed-by: Benoit L <lizeb@chromium.org>
Commit-Queue: Matthew Cary <mattcary@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579351}
[modify] https://crrev.com/b27715713a58846b2cdde9c7b94b9bfbb585ecf3/tools/cygprofile/phased_orderfile.py
[modify] https://crrev.com/b27715713a58846b2cdde9c7b94b9bfbb585ecf3/tools/cygprofile/phased_orderfile_unittest.py

phased_orderfile.py is gone, stability metrics no longer relevant.