ios: Cleanup - remove unnecessary semicolons in WebStateObserver.

ios: Cleanup - remove unnecessary semicolons in WebStateObserver.

As noted in https://codereview.chromium.org/780873002/

BUG=None
R=sdefresne@chromium.org

Committed: https://crrev.com/e8f73201164fed4974501803843a71c03f537ae1
Cr-Commit-Position: refs/heads/master@{#308348}

[tfarina, 2014-12-13 01:23:28]

PTAL

[sdefresne, 2014-12-13 10:31:28]

sdefresne@chromium.org changed reviewers:
+ sdefresne@chromium.org

[sdefresne, 2014-12-13 10:31:29]

lgtm

[tfarina, 2014-12-14 01:31:37]

The CQ bit was checked by tfarina@chromium.org

[commit-bot: I haz the power, 2014-12-14 01:32:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/797363003/1

[commit-bot: I haz the power, 2014-12-14 01:35:34]

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

[commit-bot: I haz the power, 2014-12-14 01:35:35]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[stuartmorgan, 2014-12-15 14:15:15]

lgtm

[sdefresne, 2014-12-15 14:29:10]

The CQ bit was checked by sdefresne@chromium.org

[commit-bot: I haz the power, 2014-12-15 14:29:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/797363003/1

[commit-bot: I haz the power, 2014-12-15 14:36:36]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-12-15 14:37:25]

Patchset 1 (id:??) landed as
https://crrev.com/e8f73201164fed4974501803843a71c03f537ae1
Cr-Commit-Position: refs/heads/master@{#308348}