Backed out 8 changesets (bug 803299) because it makes Tcheckerboard and Tpan so much worse

Backed out changeset f0311781c218 (bug 803299)
Backed out changeset 946467115924 (bug 803299)
Backed out changeset 59af481d8888 (bug 803299)
Backed out changeset 99a03f7ca8a4 (bug 803299)
Backed out changeset 44539f533a92 (bug 803299)
Backed out changeset 3f3963a3ebf6 (bug 803299)
Backed out changeset 5269f0483d1e (bug 803299)
Backed out changeset a9485787fdb1 (bug 803299)