Merge parseBorderRadius and parseInsetRoundedCorners

Merge parseBorderRadius and parseInsetRoundedCorners into one
method called parseRadii, since they do roughly the same thing.
Since parseRadii does not add properties, do that when handling
the CSSPropertyBorderRadius case.

BUG=499780

Review URL: https://codereview.chromium.org/1311413004

Cr-Commit-Position: refs/heads/master@{#368596}
2 files changed