Summary:
`console.error(err)` are hard to identify in the codebase especially
as we often don't have reliable stack trace information.
I've already cleaned up a bunch of them manually by going after the most
high-firing ones; this should make it easier to identify the remaining ones.
Reviewed By: jknoxville
Differential Revision: D27913964
fbshipit-source-id: 0ff6624a0c083829846550b40954945d655b7cf6
3431206c0e