Remove quirks mode check that should have been removed when standards-mode and quirks-mode text-decorations were merged in bug 403524, changeset 83b2648ee442. (Bug 680505, patch 2) r=roc

This code is a little bit sketchy, but given that text-decoration
drawing is the same across modes we shouldn't have a quirks mode check
here (though there's a decent argument to be made that we shouldn't be
checking text decorations at all).

layout/generic/nsTextFrameThebes.cpp

@@ -6628,8 +6628,7 @@ RoundOut(const gfxRect& aRect)
 nsRect
 nsTextFrame::ComputeTightBounds(gfxContext* aContext) const
 {
-  if ((GetStyleContext()->HasTextDecorationLines() &&
-       eCompatibility_NavQuirks == PresContext()->CompatibilityMode()) ||
+  if (GetStyleContext()->HasTextDecorationLines() ||
       (GetStateBits() & TEXT_HYPHEN_BREAK)) {
     // This is conservative, but OK.
     return GetVisualOverflowRect();