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WebStateListMetricsBrowser requires SessionRestorationBrowserAgent,
so it must be initialized earlier.

Also initialize WebStateListMetricsBrowser member variables that were
left uninitialized.

Bug: 1132784
Change-Id: I28b9d5afca58870a6273eb1c3b3418a45c9fcd69
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2435344
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Auto-Submit: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811236}