Revert 118546 because it caused PrerenderHTML5VideoNetwork to timeout on windows and linux

"""
Fire canplaythrough as soon as download defers to fix autoplay

Reenables delayed firing of canplaythrough for media elements, and fixes
the bug that had been introduced where a video with autoplay=true sometimes
never starts. With this change, a video with autoplay=true should always
(though not necessarily immediately) start playback on its own.

BUG=106480,73609
TEST=media_unitests, manually checking video files in various conditions

Review URL: https://chromiumcodereview.appspot.com/9113023

TBR=vrk@google.com
Review URL: https://chromiumcodereview.appspot.com/9269027

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@118590 0039d316-1c4b-4281-b951-d872f2087c98
7 files changed