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This reverts commit 1c7e3e09.

Breaks PhoneSimulator and TabletSimulator bots:

Failed steps failed ios_chrome_integration_egtests (iphone 5 ios 10.0) on mac failed ios_chrome_settings_egtests (iphone 5 ios 10.0) on mac failed ios_chrome_ui_egtests (iphone 5 ios 10.0) on mac failed ios_chrome_external_url_egtests (iphone 5 ios 10.0) on mac failed ios_internal_chrome_external_url_egtests (iphone 5 ios 10.0) on mac failed failure reason

[0612/124347.435892:FATAL:browser_view_controller.mm(995)] Check failed: _isShutdown. -shutdown must be called before dealloc.

TBR=sdefresne@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2930363003
Cr-Commit-Position: refs/heads/master@{#478783}