[iOS] Fix constness issue in side_swipe_gesture_recognizer

[iOS] Fix constness issue in side_swipe_gesture_recognizer

Committed: https://crrev.com/e67609cd84b41ffc49a74666fca69f5e033eb887
Cr-Commit-Position: refs/heads/master@{#326030}

[droger, 2015-04-10 14:57:56]

droger@chromium.org changed reviewers:
+ jbbegue@chromium.org

[jbbegue (google), 2015-04-10 17:43:21]

jbbegue@google.com changed reviewers:
+ jbbegue@google.com

[jbbegue (google), 2015-04-10 17:43:22]

lgtm

[droger, 2015-04-10 17:43:53]

The CQ bit was checked by droger@chromium.org

[commit-bot: I haz the power, 2015-04-10 17:45:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1078133002/1

[commit-bot: I haz the power, 2015-04-10 17:45:14]

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

[commit-bot: I haz the power, 2015-04-10 17:45:14]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer,
_not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[droger, 2015-04-15 14:03:07]

droger@chromium.org changed reviewers:
+ pkl@chromium.org

[droger, 2015-04-15 14:03:08]

+pkl as jbbegue is not a committer yet.

[droger, 2015-04-21 13:28:52]

droger@chromium.org changed reviewers:
+ sdefresne@chromium.org
- jbbegue@google.com, pkl@chromium.org

[droger, 2015-04-21 13:28:53]

-pkl (OOO)
+ sdefresne

[sdefresne, 2015-04-21 14:06:54]

The CQ bit was checked by sdefresne@chromium.org

[sdefresne, 2015-04-21 14:06:54]

lgtm

[commit-bot: I haz the power, 2015-04-21 14:07:29]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1078133002/1

[commit-bot: I haz the power, 2015-04-21 14:26:25]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-21 14:27:26]

Patchset 1 (id:??) landed as
https://crrev.com/e67609cd84b41ffc49a74666fca69f5e033eb887
Cr-Commit-Position: refs/heads/master@{#326030}