Remove duplicate code from bad merge.
Remove duplicate code from bad merge.

A chunk of code in diagnostic.html was accidentally duplicated due to a
bad merge. This CL removes it.

Bug: chromium:918208
Change-Id: I92d82adc1c79ec0ecffe679c43b8ae9dc9250ae2
Reviewed-on: https://chromium-review.googlesource.com/c/1496555
Reviewed-by: Simon Hatch <490a224d89645d3fea983d7189ce51bde0a00c1d@chromium.org>
Commit-Queue: Ben Hayden <d3ffe0e065c2328e497bb32a07f4dcb29138ef5b@chromium.org>

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