Fix python scripts in src/ppapi/

Fix python scripts in src/ppapi/

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.

Minor python style fixes.

TBR=noelallen
BUG=105108
TEST=


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=117045

[M-A Ruel, 2011-11-23 02:08:34]

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

[noelallen_use_chromium, 2011-11-23 02:10:57]

LGTM

[M-A Ruel, 2011-11-23 02:12:32]

On 2011/11/23 02:10:57, noelallen wrote:
> LGTM

Note: I'll mark it as TBR because of ppapi/PRESUBMIT.py which would require
another owner lgtm, blah.

[commit-bot: I haz the power, 2011-11-23 17:55:03]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/maruel@chromium.org/8653004/1

[commit-bot: I haz the power, 2011-11-23 20:30:33]

Try job failure for 8653004-1 (retry) (previous was lost) on mac_rel for step
"media_unittests".
It's a second try, previously, step "media_unittests" failed.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=mac_rel&nu...

[noelallen1, 2011-12-01 18:00:54]

You may want to resubmit this.
LGTM

[commit-bot: I haz the power, 2012-01-10 16:33:05]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/maruel@chromium.org/8653004/14002

[commit-bot: I haz the power, 2012-01-10 17:47:02]

Change committed as 117045