setOrientTo{Auto|Angle} should reflect on orient attribute

Earlier, setOrientTo{Auto|Angle} modifies only the SVGAngle value and units,
but not changing orient attribute value.
As per the spec, it should set the value on orient attribute.
https://www.w3.org/TR/svg-markers/#__svg__SVGMarkerElement__setOrientToAuto

BUG=586330

Review URL: https://codereview.chromium.org/1699893003

Cr-Commit-Position: refs/heads/master@{#376718}
2 files changed