commit 9e42572a191d565d3cdf8650e88c4971a1b6441c
author sdefresne <sdefresne@chromium.org> Fri Mar 24 14:24:38 2017
committer Commit bot <commit-bot@chromium.org> Fri Mar 24 14:24:38 2017
tree 32b8a1c5f217e358bb98657887bc2080541a509a
parent 0f7b1afa9784fa186cc18dae4bb43c096dc6616b

[ios] Extend WebStateListObserver amd WebStateListDelegate APIs.

In preparation of moving the ownership of all WebStates to WebStateList,
add methods to WebStateListObserver and WebStateListDelegate called when
the WebStates are detached or closed.

Rename the |index| parameters to |atIndex| for WebStateListObserving
protocol for consistency (some where called |index| other |atIndex|).

BUG=546222

Review-Url: https://codereview.chromium.org/2768093003
Cr-Commit-Position: refs/heads/master@{#459417}