Changes to media.gyp for Chromoting iOS client

Changes to media.gyp for Chromoting iOS client

This makes the following changes to media.gyp to make it compile for iOS (for
the Chromoting iOS client):

- Don't use ffmpeg or libvpx in media (just like Android)
- Do use libyuv
- Add yasm flag to decorate functions correctly for iOS (just like in the Mac)

BUG=134226
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=289973

[dcaiafa, 2014-08-14 00:15:09]

PTAL

[DaleCurtis, 2014-08-14 00:25:31]

lgtm

[dcaiafa, 2014-08-14 16:25:00]

The CQ bit was checked by dcaiafa@chromium.org

[commit-bot: I haz the power, 2014-08-14 16:28:04]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/dcaiafa@chromium.org/474693002/20001

[commit-bot: I haz the power, 2014-08-15 00:49:42]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  android_aosp on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/android_aosp/bu...)

[commit-bot: I haz the power, 2014-08-15 06:50:04]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-08-15 06:50:05]

Try jobs failed on following builders:
  android_aosp on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/android_aosp/bu...)

[dcaiafa, 2014-08-15 18:03:29]

The CQ bit was checked by dcaiafa@chromium.org

[commit-bot: I haz the power, 2014-08-15 18:06:05]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/dcaiafa@chromium.org/474693002/20001

[commit-bot: I haz the power, 2014-08-15 19:25:57]

Committed patchset #2 (20001) as 289973