Fix parsing of <body link vlink alink>

We use the correct legacy rules for bgcolor and text but not the link/vlink/alink attributes on body.
This should also not be conditional on quirks mode.

The change adds parsing color from link/vlink/alink attributes using legacy rules.

BUG=605534

Review-Url: https://codereview.chromium.org/1921823006
Cr-Commit-Position: refs/heads/master@{#395242}
6 files changed