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Remove the usage of it in BVC and TabModel and replace with
SessionRestorationBrowserAgent directly.

Also remove isRestoring from TabModel and use the one from
SessionRestorationBrowserAgent directly when needed.

Update earlgrey test util to use SessionRestorationBrowserAgent instead
of tabModel for saving sessions.

Also remove the tests which uses the saveSessionImmediately method from
tabModel unittests as similar tests exist in SessionRestorationAgent
tests.

Bug: 1045226
Change-Id: Iafd7062ce505c466e7cf2a76e49ef3301dbcd6d1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2018173
Commit-Queue: Mohammad Refaat <mrefaat@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735568}