The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/90396e6b910b9e4e9604074274d21ac0df14831f

commit 90396e6b910b9e4e9604074274d21ac0df14831f
Author: eugenebut <eugenebut@chromium.org>
Date: Sat Feb 04 00:52:18 2017

Unit tests for WebStateObserverBridge class.

BUG= 685397 

Review-Url: https://codereview.chromium.org/2674503002
Cr-Commit-Position: refs/heads/master@{#448131}

[modify] https://crrev.com/90396e6b910b9e4e9604074274d21ac0df14831f/ios/web/BUILD.gn
[add] https://crrev.com/90396e6b910b9e4e9604074274d21ac0df14831f/ios/web/public/test/fakes/crw_test_web_state_observer.h
[add] https://crrev.com/90396e6b910b9e4e9604074274d21ac0df14831f/ios/web/public/test/fakes/crw_test_web_state_observer.mm
[add] https://crrev.com/90396e6b910b9e4e9604074274d21ac0df14831f/ios/web/web_state/web_state_observer_bridge_unittest.mm