Bug 927734 - Loosen assertions about the contents of the style scope stack. r=dbaron

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extra : rebase_source : 6b9b7e4051bebeb7da640c7878229b1d014841dd
Bug 930270 - Don't initialize the ancestor filter for elements outside the document. r=dbaron

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extra : rebase_source : fa10a28a8bbd9eaf670f8133ccd81a9c706ebec7
Bug 928798 - Check nsSVGTextFrame2 for dirtiness when gettings it bounding box contribution. r=roc

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extra : rebase_source : e9173104309e532e9e6773132b9a867e47c3ea11