Delete MacVDA from the codebase since it is dead code and not being worked on.

Delete MacVDA from the codebase since it is dead code and not being worked on.

http://crbug.com/133828#c36 summarizes why this wasn't turned on.
Also related: http://openradar.appspot.com/radar?id=1845403 

BUG=133828
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=196621

[Ami GONE FROM CHROMIUM, 2013-04-25 18:30:19]

scherkus: please review
sail: FYI and :'(

[Ami GONE FROM CHROMIUM, 2013-04-25 19:17:43]

thakis: please OWNERS for ui/
jam: please OWNERS for content/*gypi
Thanks!

[Nico, 2013-04-25 19:30:36]

Can you say in the CL description why this isn't used (iirc it turned out to be
unstable in practice? In that case, can you also include links to the rdar bugs
we filed about that?)

[Ami GONE FROM CHROMIUM, 2013-04-25 19:55:42]

On Thu, Apr 25, 2013 at 12:30 PM, <thakis@chromium.org> wrote:

> Can you say in the CL description why this isn't used (iirc it turned out
> to be
> unstable in practice?  In that case, can you also include links to the
> rdar bugs

we filed about that?)
>

 Done.

[scherkus (not reviewing), 2013-04-25 20:14:57]

LGTM

WDYT about modifying the kOsDesktop value for disable-accelerated-video-decode
so that flag doesn't show up on platforms where we know it is isn't supported?
(e.g., Mac)

https://code.google.com/p/chromium/codesearch#chromium/src/chrome/browser/abo...

[Nico, 2013-04-25 20:24:13]

lgtm

[Ami GONE FROM CHROMIUM, 2013-04-25 20:37:09]

On Thu, Apr 25, 2013 at 1:14 PM, <scherkus@chromium.org> wrote:

> WDYT about modifying the kOsDesktop value for disable-accelerated-video-**
> decode
> so that flag doesn't show up on platforms where we know it is isn't
> supported?
>

Excellent; I didn't know about this.  Done.  PTAL.

[scherkus (not reviewing), 2013-04-25 20:47:26]

LGTM++

[jam, 2013-04-25 23:46:45]

lgtm

[commit-bot: I haz the power, 2013-04-26 00:43:22]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/fischman@chromium.org/14401013/11002

[commit-bot: I haz the power, 2013-04-26 05:14:21]

Change committed as 196621