Remove iOS specific code from ChromeRLZTrackerDelegate.

Remove iOS specific code from ChromeRLZTrackerDelegate.

iOS has its own implementation of RLZTrackerDelegate in //ios/chrome/rlz
so remove code protected by OS_IOS in chrome_rlz_tracker_delagate.{h,cc}.

Fix #include.

BUG=511570
Committed: https://crrev.com/bd4c75c67e6830740a023353c729e722c41e59ef
Cr-Commit-Position: refs/heads/master@{#339850}

[sdefresne, 2015-07-20 17:30:58]

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

[sdefresne, 2015-07-20 17:30:58]

Please take a look.

[Roger Tawa OOO till Jul 10th, 2015-07-21 16:32:45]

lgtm

[sdefresne, 2015-07-22 08:59:23]

The CQ bit was checked by sdefresne@chromium.org

[sdefresne, 2015-07-22 08:59:24]

The patchset sent to the CQ was uploaded after l-g-t-m from rogerta@chromium.org
Link to the patchset: https://codereview.chromium.org/1243733002/#ps20001
(title: "Fix overzealous #include removal")

[commit-bot: I haz the power, 2015-07-22 08:59:51]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1243733002/20001

[commit-bot: I haz the power, 2015-07-22 09:06:26]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-07-22 09:07:08]

Patchset 2 (id:??) landed as
https://crrev.com/bd4c75c67e6830740a023353c729e722c41e59ef
Cr-Commit-Position: refs/heads/master@{#339850}