memento_updater: Move all non-script source to src folder.

Rewrite Makefile so it goes to src/ for everything.

Note the split_write.cc already has a copy inside src/, so this commit only
deletes the original one.

BUG=chrome-os-partner:21938
TEST=emerge-link memento_softwareupdate
CQ-DEPEND=CL:178390

Change-Id: I569759d7eba413653b405c06ad3ba8bec23f030f
Reviewed-on: https://chromium-review.googlesource.com/178400
Tested-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Rong Chang <rongchang@chromium.org>
Commit-Queue: Hung-Te Lin <hungte@chromium.org>
2 files changed