Fix crash for <audio> WebKit doesn't provide a FrameView for <audio> in MediaPlayer which is need for us to create a WebMediaPlayerDelegateImpl, so don't rely on MediaPlayer::m_frameView but static_cast MediaPlayer::m_mediaPlayerClient to HTMLMediaElement and gets FrameView from it's Document object.
Fix crash for <audio>
WebKit doesn't provide a FrameView for <audio> in MediaPlayer
which is need for us to create a WebMediaPlayerDelegateImpl,
so don't rely on MediaPlayer::m_frameView but static_cast
MediaPlayer::m_mediaPlayerClient to HTMLMediaElement and
gets FrameView from it's Document object.

Review URL: http://codereview.chromium.org/69012

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@13782 0039d316-1c4b-4281-b951-d872f2087c98

Crystalnix/house-of-life-chromium,adobe/chromium,ropik/chromium,adobe/chromium,yitian134/chromium,yitian134/chromium,gavinp/chromium,yitian134/chromium,adobe/chromium,adobe/chromium,gavinp/chromium,gavinp/chromium,Crystalnix/house-of-life-chromium,adobe/chromium,gavinp/chromium,Crystalnix/house-of-life-chromium,gavinp/chromium,adobe/chromium,yitian134/chromium,Crystalnix/house-of-life-chromium,Crystalnix/house-of-life-chromium,ropik/chromium,yitian134/chromium,ropik/chromium,yitian134/chromium,gavinp/chromium,ropik/chromium,ropik/chromium,yitian134/chromium,Crystalnix/house-of-life-chromium,ropik/chromium,gavinp/chromium,yitian134/chromium,gavinp/chromium,yitian134/chromium,adobe/chromium,ropik/chromium,adobe/chromium,adobe/chromium,Crystalnix/house-of-life-chromium,Crystalnix/house-of-life-chromium,adobe/chromium,ropik/chromium,Crystalnix/house-of-life-chromium,Crystalnix/house-of-life-chromium,gavinp/chromium,adobe/chromium,Crystalnix/house-of-life-chromium,ropik/chromium,gavinp/chromium,yitian134/chromium