Backed out 4 changesets (bug 993580)

Backed out changeset 6d03d1592b53 (bug 993580)
Backed out changeset 0029bb4a9c3c
Backed out changeset 927a038208a2
Backed out changeset f0fd885f5f7b
Bug 993580 - Permanently fix webconsole error count test and temporarily fix box model tests, r=pbrosset