Use native style property names instead of jQuery's css map

Removes a bit of jQuery abstraction which might save bit of
performance.

It presumably also compresses slightly better in gzip for cases
where we have associated properties and variables, such as:
 css({ minWidth: dim.minWidth })
Though, while the compression window is probably too small, in
ResourceLoader the other variant could've been compressed better
due to matching patterns from actual CSS.

This completes our transition to valid identifiers as keys and
using of native interfaces. (Similar to node.scrollWidth, we now
essentially also use node.style.minWidth regularly.)

Change-Id: I158eab952758d367a76e0543f7c24fd154b881b4