quipper: Remove inheritance of Perf{Reader|Parser|Serializer}

Instead of having these classes inherit one another, split them into
separate classes whose functions take the others as arguments.

BUG=chromium:568870
TEST=unit tests pass

Change-Id: I33e313b53c415d0c3437fcbfab7515e80efadf7a
Signed-off-by: Simon Que <sque@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/318369
13 files changed