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On the current implementation, on a navigation error, the
error_retry_state_machine expect a second navigation after any error to
load the error page.
When displaying an offline page, this second navigation displayes a
native content and DidFinishNavigation is never called, so the
navigation is not cleaned.
On reload, this causes a DCHECK and a navigation failure.

This CL report a success on native navigation.

Note:
While this fix gives the expected result, there is still a bug in the
error_retry_state_maching as the state will be put in
kDisplayingWebErrorForFailedNavigation instead of success state.
Fixing this behavior is not in the scope of this CL and can be fixed in
the future by ErrorRetryStateMachine owners.

Bug: 904784
Change-Id: Ic4efe212f933e8631f1b97dbf1a5633dd8a8cc54
Reviewed-on: https://chromium-review.googlesource.com/c/1335932
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Danyao Wang <danyao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608412}