Complete rename of MediaHasVideo bit to MediaCanToggleControls.

First half of this rename was committed as r170701.

Chromium side change is https://codereview.chromium.org/201573013/.

BUG=179489

Review URL: https://codereview.chromium.org/224183003

git-svn-id: svn://svn.chromium.org/blink/trunk@170922 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Make various animation classes noncopyable

These classes are passed around as non-const references. In order to prevent
accidental assignments, we should make them as noncopyable.

R=dstockwell@chromium.org

Review URL: https://codereview.chromium.org/225983004

git-svn-id: svn://svn.chromium.org/blink/trunk@170923 bbb929c8-8fbe-4397-9dbb-9b2b20218538