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This reverts commit 13de3702.

Reason for revert: breaks '-[ExternalURLSigninTestCase testSignInReauthenticate]' EarlGrey test.

Original change's description:
> Fix restoration of session after a crash.
> 
> Disable sending kTabModelNewTabWillOpenNotification notification
> when the TabModel is restoring a session as this breaks the BVC
> state that does not expect the notification to be sent when a tab
> is added due to session restoration.
> 
> Bug: 763964
> Change-Id: I404487b5a561e43fe4d23303c004e4d3e8701dfe
> Reviewed-on: https://chromium-review.googlesource.com/664557
> Reviewed-by: Rohit Rao (ping after 24h) <rohitrao@chromium.org>
> Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#501614}

TBR=rohitrao@chromium.org,sdefresne@chromium.org

Change-Id: I917e129b14d351bf66527a6620c4f67f97eaa8aa
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 763964
Reviewed-on: https://chromium-review.googlesource.com/664706Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#501667}