Correct initial width/height for <use>d <symbol>s
The initial values for width/height on the <svg> generated for the
<symbol> should be "100%".
Since the <symbol> element had been replaced by a <svg> element by the
time the attributes were transferred the wrong set of rules were used.
Adjust svg/custom/use-attribute-invalidations.html to be correct.
svg/custom/relative-sized-shadow-tree-content-with-symbol.xhtml now
renders correctly.
BUG=592063
Review URL: https://codereview.chromium.org/1757993007
Cr-Commit-Position: refs/heads/master@{#379350}
5 files changed
