Don't double merge JSON files.
Don't double merge JSON files.

Change-Id: I12d66e3a5eb1e3f1a1a4e32d3e613de2f273289a

DrMarcII/rules_webtesting,bazelbuild/rules_webtesting,DrMarcII/rules_webtesting,DrMarcII/rules_webtesting,bazelbuild/rules_webtesting,bazelbuild/rules_webtesting,DrMarcII/rules_webtesting,bazelbuild/rules_webtesting