Remove --pnacl-dir override flag.

Remove --pnacl-dir override flag.

It was added in case a test harness needed to point at 
a mock PNaCl component, but that can be done without
the commandline switch.

BUG=none (flags cleanup)

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=255786

[sky, 2014-03-07 17:28:25]

LGTM

[jvoung (off chromium), 2014-03-07 17:34:57]

The CQ bit was checked by jvoung@chromium.org

[commit-bot: I haz the power, 2014-03-07 17:35:53]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jvoung@chromium.org/189853002/1

[commit-bot: I haz the power, 2014-03-07 17:36:22]

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

[commit-bot: I haz the power, 2014-03-07 17:36:22]

Try jobs failed on following builders: mac_chromium_compile_dbg,
mac_chromium_rel

[jvoung (off chromium), 2014-03-07 18:59:22]

The CQ bit was checked by jvoung@chromium.org

[commit-bot: I haz the power, 2014-03-07 19:01:18]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jvoung@chromium.org/189853002/1

[commit-bot: I haz the power, 2014-03-07 19:06:56]

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

[commit-bot: I haz the power, 2014-03-07 19:06:57]

Try jobs failed on following builders: mac_chromium_compile_dbg,
mac_chromium_rel

[jvoung (off chromium), 2014-03-07 21:49:37]

The CQ bit was checked by jvoung@chromium.org

[commit-bot: I haz the power, 2014-03-07 21:52:01]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jvoung@chromium.org/189853002/1

[commit-bot: I haz the power, 2014-03-08 11:02:52]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jvoung@chromium.org/189853002/1

[commit-bot: I haz the power, 2014-03-08 18:02:33]

Change committed as 255786