The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/9b2fb40242a52cf1cf25b14eff6f095432c7bb81

commit 9b2fb40242a52cf1cf25b14eff6f095432c7bb81
Author: eugenebut <eugenebut@chromium.org>
Date: Wed Mar 01 22:53:02 2017

Cleaned up code duplication in -[CRWWebController goToItemAtIndex:].

Moved updateDesktopUserAgentForEntry:fromEntry: out of conditional
blocks, because the calls order does not matter as long as |toEntry| is
correct.

Removed unnecessary webWillFinishHistoryNavigationFromEntry: call. For
same-document navigations Tab gets webState:didFinishNavigation: call
and for different-document navigations Tab gets
webState:didStartProvisionalNavigationForURL:. Both calls update the
toolbar, which is the only thing done in
webWillFinishHistoryNavigationFromEntry:.

BUG= 684098 

Review-Url: https://codereview.chromium.org/2728723002
Cr-Commit-Position: refs/heads/master@{#454079}

[modify] https://crrev.com/9b2fb40242a52cf1cf25b14eff6f095432c7bb81/ios/web/web_state/ui/crw_web_controller.mm

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/725f29f1dd104cbc643cd14af8eebf768520b27c

commit 725f29f1dd104cbc643cd14af8eebf768520b27c
Author: kkhorimoto <kkhorimoto@chromium.org>
Date: Thu Mar 09 00:38:53 2017

Removed CRWSessionEntry from CRWWebController.

BUG=454984,  684098 

Review-Url: https://codereview.chromium.org/2705673003
Cr-Commit-Position: refs/heads/master@{#455615}

[modify] https://crrev.com/725f29f1dd104cbc643cd14af8eebf768520b27c/ios/chrome/browser/tabs/tab.mm
[modify] https://crrev.com/725f29f1dd104cbc643cd14af8eebf768520b27c/ios/web/navigation/session_storage_builder.mm
[modify] https://crrev.com/725f29f1dd104cbc643cd14af8eebf768520b27c/ios/web/public/web_state/ui/crw_web_delegate.h
[modify] https://crrev.com/725f29f1dd104cbc643cd14af8eebf768520b27c/ios/web/web_state/ui/crw_web_controller.h
[modify] https://crrev.com/725f29f1dd104cbc643cd14af8eebf768520b27c/ios/web/web_state/ui/crw_web_controller.mm
[modify] https://crrev.com/725f29f1dd104cbc643cd14af8eebf768520b27c/ios/web/web_state/ui/crw_web_controller_unittest.mm
[modify] https://crrev.com/725f29f1dd104cbc643cd14af8eebf768520b27c/ios/web/web_state/web_state_impl.mm