Remove extern keyword in definition

Remove extern keyword in definition

For consistency with other definition in the same file.
Extern declaration already did in chrome_constants.h

BUG=NONE
TEST=Compiles


Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=170940

[simonhong_, 2012-12-03 18:44:46]

Dear Ben,
Please review this patch.
Thank you.

[Ben Goodger (Google), 2012-12-03 18:46:05]

lgtm

[commit-bot: I haz the power, 2012-12-03 19:01:56]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/simon.hong81@gmail.com/11428142/1

[commit-bot: I haz the power, 2012-12-03 23:45:06]

Retried try job too often on mac_rel for step(s) browser_tests

[commit-bot: I haz the power, 2012-12-04 00:12:08]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/simon.hong81@gmail.com/11428142/1

[commit-bot: I haz the power, 2012-12-04 04:47:12]

Retried try job too often on mac_rel for step(s) browser_tests

[commit-bot: I haz the power, 2012-12-04 05:38:33]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/simon.hong81@gmail.com/11428142/1

[commit-bot: I haz the power, 2012-12-04 08:52:49]

Retried try job too often on mac_rel for step(s) browser_tests

[commit-bot: I haz the power, 2012-12-04 10:59:52]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/simon.hong81@gmail.com/11428142/1

[commit-bot: I haz the power, 2012-12-04 12:08:56]

Change committed as 170940