Fix synchronization of SVGAnimatedAngle (<marker orient>)
Since SVGAnimatedAngle also wraps the SVGAnimatedEnumeration for the
enumeration representation of the 'orient' attribute, and both of them
synchronize to said attribute, we need to override the synchronization
methods to take the synchronization status of them both into account
(as opposed to previously where only the SVGAnimatedAngle itself was
considered.) Rewrite the existing synchronizeAttribute() implementation
to just delegate rather than do the actual work itself.
Also change reference from SVGMarkerElement to just SVGElement and
include the specific header - SVGAngle.h rather than SVGAngleTearOff.h.
BUG=589808
Review URL: https://codereview.chromium.org/1739533004
Cr-Commit-Position: refs/heads/master@{#377875}
3 files changed
