Fix python scripts in src/media

Fix python scripts in src/media

Make sure that:
- shebang is only present for executable files
- shebang is #!/usr/bin/env python
- __main__ is only present for executable files
- file's executable bit is coherent

Also fix EOF LF to be only one.

R=imasaki@chromium.org
BUG=105108
TEST=


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=111438

[M-A Ruel, 2011-11-23 02:20:26]

Context: I'm going to add a presubmit check to enforce some of these rules.

[imasaki1, 2011-11-23 21:05:19]

On 2011/11/23 02:20:26, Marc-Antoine Ruel wrote:
> Context: I'm going to add a presubmit check to enforce some of these rules.

LGTM.

[commit-bot: I haz the power, 2011-11-23 21:23:12]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/maruel@chromium.org/8672007/1

[commit-bot: I haz the power, 2011-11-23 23:33:31]

Change committed as 111438