binary_size: Fix jobs number parsing

binary_size: Fix jobs number parsing

BUG=

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=276164

[emoller, 2014-06-10 09:39:17]

The jobs parameter in the updated binary size tool was read in as a string and
caused it to spawn a lot of processes. Adding an integer type to optparse fixes
it.

[Andrew Hayden (chromium.org), 2014-06-10 09:40:57]

Whoops. LGTM, thanks for fixing.

[emoller, 2014-06-10 09:44:03]

The CQ bit was checked by emoller@opera.com

[commit-bot: I haz the power, 2014-06-10 09:47:28]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/emoller@opera.com/321163003/1

[commit-bot: I haz the power, 2014-06-10 17:04:30]

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

[commit-bot: I haz the power, 2014-06-10 17:45:21]

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

[commit-bot: I haz the power, 2014-06-10 17:45:22]

Try jobs failed on following builders:
  android_clang_dbg on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/android_clang_dbg/bui...)

[Andrew Hayden (chromium.org), 2014-06-10 20:30:30]

The CQ bit was checked by andrewhayden@chromium.org

[commit-bot: I haz the power, 2014-06-10 20:31:52]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/emoller@opera.com/321163003/1

[commit-bot: I haz the power, 2014-06-10 21:37:21]

Change committed as 276164