We don't need two separate tests that collect perf info -- merge them.

This CL merges the platform_Shutdown logic in to platform_BootPerfServer.
There really isn't any reason to have two of these tests and the latter
should do the former.

BUG=chromium-os:36226
TEST=Ran it.

Change-Id: I800a1c8d9fb6aec99b1749a055c5d5824db6c438
Reviewed-on: https://gerrit.chromium.org/gerrit/37773
Tested-by: Chris Sosa <sosa@chromium.org>
Reviewed-by: Richard Barnette <jrbarnette@chromium.org>
Reviewed-by: Scott Zawalski <scottz@chromium.org>
Commit-Ready: Chris Sosa <sosa@chromium.org>
5 files changed