MediaStream API: Update RTCIceCandidate to match the Spec
The members of RTCIceCandidate are no longer read-only.

BUG=349437

Review URL: https://codereview.chromium.org/187673002

git-svn-id: svn://svn.chromium.org/blink/trunk@168586 bbb929c8-8fbe-4397-9dbb-9b2b20218538
[SVG] Make all C-macros used in the old property implementation NOOP.

This CL also removes all calls to |localAttributeToPropertyMap()| and |registerAnimatedPropertiesFor##OwnerType()|, the methods which were defined via the macros. This map was already empty, so no change in behavior.
|SVGElement::cleanupAnimatedProperties()| contents are moved back to |~SVGElement()| again, as they were temporary workaround for the old SVGProperty implementation bug.

BUG=308818
NOTRY=true

Review URL: https://codereview.chromium.org/177803003

git-svn-id: svn://svn.chromium.org/blink/trunk@168587 bbb929c8-8fbe-4397-9dbb-9b2b20218538