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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

Review URL: https://codereview.chromium.org/1243733002

Cr-Commit-Position: refs/heads/master@{#339850}