Bug 827713 - Adjust expected assertion annotations to fix WinXP debug mochitest orange.
Backed out 6 changesets (bug 827713) for reftest failures.

Backed out changeset 014cc3de08fb (bug 827713)
Backed out changeset 4113172193aa (bug 827713)
Backed out changeset 27a5c8dd5ff7 (bug 827713)
Backed out changeset 6448c7e05f11 (bug 827713)
Backed out changeset b67a72618c66 (bug 827713)
Backed out changeset 1279664e0d41 (bug 827713)
Bug 898489: Mark content/xul/content/src/ and content/xul/document/src/ as FAIL_ON_WARNINGS. r=smaug r=gps
Bug 898126 - Cache client hit test values, r=jimm
Bug 899238 - Make sure CPOW parent is never null (r=dvander).