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With SlimNavigationManager enabled, the resent post request dialog is
presented while the load is still ongoing. On iPad, this displays a
loading spinner on the tab UI which interferes with EarlGrey
synchronization.

Disable synchronization while the dialog is shown if
SlimNavigationManager is enabled.

Bug: 968296
Change-Id: Ib67693a451dd8170746b4f2329ca4eed82fc254e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1645434Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Auto-Submit: Mike Dougherty <michaeldo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666439}