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- several places where we use a getter knowing that it will return a subclass of its declared type, even asserting that it does, but where the analyzer is worried that the getter might start returning a new value unexpectedly, solved by having a temporary local variable shadow the getter and asserting that it doesn't change value - many many places where we do this with parentData specifically, solved by type-erasing parentData. - a place where a mixin wants to be subclassing another class, and uses its methods, solved by saying that the mixin is abstract but implements the superclass R=abarth@chromium.org Review URL: https://codereview.chromium.org/1160923008