Invalidate SVG 'transform' pres. attribute style even if not attached

When the 'transform' attribute was manipulated via its SVG DOM
representation (SVGTransformList), the
presentation-attribute-style-is-dirty flag would not be set unless the
element had been attached.
Reorder the contents of the 'transform' branch in
SVGGraphicsElement::svgAttributeChanged so that the presentation
attribute style is always dirtied regardless of attachment status.

BUG=701075

Review-Url: https://codereview.chromium.org/2745053005
Cr-Commit-Position: refs/heads/master@{#456696}
(cherry picked from commit 8554eac989977ff9d7f82444c01a500430097919)

Review-Url: https://codereview.chromium.org/2755813004 .
Cr-Commit-Position: refs/branch-heads/2987@{#840}
Cr-Branched-From: ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
3 files changed