RFR: 8336097: UserAgent Styles using lookups are promoted to Author level if look-up is defined in Author stylesheet

[John Hendrikx]

This change removes the origin determination from `resolveLookups`.  Instead, the origin from the style is used.

Although a comment in the code alluded that this may cause problem with `INLINE` styles, this is not the case. Whenever a `Node` is associated with a `CssStyleHelper`, a suitable shared cache is determined for its use.  This already takes into account the presence of an inline style, and only nodes with the same inline style can share such a cache.  See `Cache#getStyleMap` and specifically this fragment where an additional selector is added for the inline style:

            if (hasInlineStyle) {
                Selector selector = cacheContainer.getInlineStyleSelector(inlineStyle);
                if (selector != null) selectors.add(selector);
            }

-------------

Commit messages:
 - Remove origin determination from resolveLookups

Changes: https://git.openjdk.org/jfx/pull/1503/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1503&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8336097
  Stats: 22 lines in 1 file changed: 0 ins; 16 del; 6 mod
  Patch: https://git.openjdk.org/jfx/pull/1503.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1503/head:pull/1503

PR: https://git.openjdk.org/jfx/pull/1503