Dashboard - Remove some old logging from graph_data.
Dashboard - Remove some old logging from graph_data.

TBR=eakuefner@chromium.org

Change-Id: I8f2e9c28d5c9597539e23900d15bb4f233aef109
Reviewed-on: https://chromium-review.googlesource.com/1055822
Reviewed-by: Simon Hatch <490a224d89645d3fea983d7189ce51bde0a00c1d@chromium.org>
Commit-Queue: Simon Hatch <490a224d89645d3fea983d7189ce51bde0a00c1d@chromium.org>

catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult