Update SVG tests ahead of offset* removal
This converts some SVG tests to use getBoundingClientRect() instead of
the deprecated offset* attributes, so that the removal CL is minimized
and thus easier to revert in case of trouble.
smil-scheduled-in-inactive-document-crash.html didn't actually run the
problematic code because of a early finishJSTest(), which was moved.
BUG=
463116
R=fs@opera.com
Committed:
https://crrev.com/6887a15a769e9de73628346f67a4bfff71b553be
Cr-Commit-Position: refs/heads/master@{#377261}