Instead of chartjson-result-file, since that's the flag passed by the recipe.
TBR=phoglund@webrtc.org
Bug: chromium:807737
Change-Id: I3a679ab7e5c0a446e675d0f4647344cc4194b357
Reviewed-on: https://webrtc-review.googlesource.com/46541
Commit-Queue: Edward Lemur <ehmaldonado@webrtc.org>
Reviewed-by: Oleh Prypin <oprypin@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21858}