Eliminate MediaPlayer abstraction(paint APIs)

BUG=350571

chromium side patch (android): https://codereview.chromium.org/409793006/

Review URL: https://codereview.chromium.org/430793002

git-svn-id: svn://svn.chromium.org/blink/trunk@179245 bbb929c8-8fbe-4397-9dbb-9b2b20218538