Bug 812822 part 1: Add flag 'eSkipFlexItemStyleFixup' to let our nsStyleContext creation functions skip the flex-item-specific chunk of ApplyStyleFixups(). r=bz
Bug 812822 part 2: Skip flex-item style fixup when resolving style for pseudo-elements. r=bz
Bug 812822 part 3: Add a TreeMatchContext flag to indicate that we should skip flex item style fixup, and use it when framing anonymous content in ConstructFrame(). r=bz
Bug 812822 part 4: add crashtests for this bug & dependent bugs. r=bz