NaCl: have browser_tester set-up the sandbox environment

NaCl: have browser_tester set-up the sandbox environment

On Linux, the setuid sandbox needs to be set in the environment.
Fix browser_tester to make use of the test_env script that
sets up the sandbox.

BUG=249900

[jln (very slow on Chromium), 2013-06-21 22:34:04]

Mark: PTAL at this small CL!

[Mark Seaborn, 2013-06-21 22:38:57]

LGTM

https://chromiumcodereview.appspot.com/17063018/diff/1/ppapi/native_client/to...
File ppapi/native_client/tools/browser_tester/browser_tester.py (right):

https://chromiumcodereview.appspot.com/17063018/diff/1/ppapi/native_client/to...
ppapi/native_client/tools/browser_tester/browser_tester.py:203: # Set-up the
environment with the setuid sandbox path.
Grammar nit: no hyphen needed :-)

[jln (very slow on Chromium), 2013-06-21 22:49:56]

https://chromiumcodereview.appspot.com/17063018/diff/1/ppapi/native_client/to...
File ppapi/native_client/tools/browser_tester/browser_tester.py (right):

https://chromiumcodereview.appspot.com/17063018/diff/1/ppapi/native_client/to...
ppapi/native_client/tools/browser_tester/browser_tester.py:203: # Set-up the
environment with the setuid sandbox path.
On 2013/06/21 22:38:57, Mark Seaborn wrote:
> Grammar nit: no hyphen needed :-)

Done.

[jln (very slow on Chromium), 2013-06-21 23:25:47]

Committed as revision 207950.