Backed out 4 changesets (bug 849713) since builds fail because of warnings as errors

Backed out changeset e811d4258d45 (bug 849713)
Backed out changeset 26aa58e87d5d (bug 849713)
Backed out changeset 9a6552161eff (bug 849713)
Backed out changeset 3551877d9b92 (bug 849713)

Landing on a CLOSED TREE
Bug 702504 - Switch windows 7 machines to larger screen resolution. r=jmaher
Bug 702504 - Mark reftests that fail with the new resolution as fuzzy. r=roc