Remove unused includes of platform/graphics/media/MediaPlayer.h

Remove unused includes of platform/graphics/media/MediaPlayer.h

All of the these files either don't reference MediaPlayer anymore, or have
had uses replaced with uses of WebMediaPlayer instead.
Also update some comments that was referring to MediaPlayer, and remove
some other includes that was obviously not used.

BUG=350571
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=188478

[fs, 2015-01-15 11:56:18]

fs@opera.com changed reviewers:
+ ddorwin@chromium.org, philipj@opera.com, rtoy@chromium.org

[fs, 2015-01-15 11:56:52]

fs@opera.com changed reviewers:
+ jl@opera.com

[fs, 2015-01-15 12:24:52]

The MediaPlayer interface is being phased out (see bug), so this removes some
includes that were left behind during that process (which isn't complete yet.)

jl: bindings/
rtoy: modules/webaudio/
ddorwin: modules/encryptedmedia/
philipj: core/

[Jens Widell, 2015-01-15 12:27:08]

LGTM

[sof, 2015-01-15 12:43:16]

lgtm

s/platforms/platform/ in commit message?

[haraken, 2015-01-15 15:29:39]

LGTM

[fs, 2015-01-15 15:37:17]

On 2015/01/15 12:43:16, sof wrote:
> lgtm
> 
> s/platforms/platform/ in commit message?

Fixed, thanks.

[fs, 2015-01-15 15:37:32]

The CQ bit was checked by fs@opera.com

[commit-bot: I haz the power, 2015-01-15 15:38:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/851073003/1

[commit-bot: I haz the power, 2015-01-15 16:40:34]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=188478

[ddorwin, 2015-01-15 17:12:30]

modules/encryptedmedia/ LGTM