Revert 169465 "Move deferred loading logic from WebMediaPlayerCl..."

Android builders fail compile

One exampel: http://chromegw.corp.google.com/i/chromium.webkit/builders/Android%20Builder/builds/36609

> Move deferred loading logic from WebMediaPlayerClientImpl to HTMLMediaElement.
> 
> BUG=350571
> TEST=All layout tests still pass.
> 
> Review URL: https://codereview.chromium.org/192013002

TBR=acolwell@chromium.org

Review URL: https://codereview.chromium.org/203213006

git-svn-id: svn://svn.chromium.org/blink/trunk@169470 bbb929c8-8fbe-4397-9dbb-9b2b20218538