Bug 851916 part 1 - Update dom/imptests/webapps/ and harness; r=Ms2ger

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rename : dom/imptests/webapps/DOMCore/tests/submissions/Ms2ger/test_ChildNode-remove.js => dom/imptests/webapps/DOMCore/tests/submissions/Ms2ger/ChildNode-remove.js
Bug 851916 part 2 - createHTMLDocument() should work with no arguments; r=bz
Back out Bug 788613 for breaking the build on Windows.
Bug 854458 - Implement keyboard navigation in TwoWayView (r=mfinkle)
Bug 854458 - Use different focus navigation direction on horizontal tabs tray (r=mfinkle)