nsDOMWindowUtils.getOMTAOrComputedStyle falls back to using getComputedStyle
when an OMTA style is not available. However, in order to be sure we are testing
OMTA, this patch adds getOMTAStyle which returns an empty string if no OMTA
style is available.
This patch also includes some minor stylistic tweaks. The method signature for
getOMTAOrComputedStyle now takes an nsIDOMElement parameter rather than
nsIDOMNode in order to simplify error-checking. (When we support OMTA of
pseudo-elements we will have to adjust the method signature but for now we only
support elements.) Also, some lines have been wrapped, ErrorResult is
declared closer to where it is used, and the return value aResult is only
truncated when returning NS_OK.
41336d20b3