At least on windows, some of the available jobs display their logview run-data unnecessarily wide on Chrome. See the example comparison of this job on Chrome vs. Firefox https://treeherder.mozilla.org/ui/logviewer.html#?job_id=805756&repo=mozilla-central
A note this bug could be addressed during broader Logviewer layout-work in bug 1102851.
And I believe this is a regression on Chrome, so marking it as such.
With the passage of time and continuing changes, this behavior has now gone away on Chrome.