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Since this can lead to a WebContents with no committed entries, deal
with that case in the browser-side Activate logic, by rejecting
activations which occur before we can say with certainty that we
will load a page (i.e. navigation commit).

Bug: 1046121,1034740,942198
Change-Id: Icd219dc0bb1e4a9ab6fdc433f8644c14e69964e4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2015768Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: Lucas Gadani <lfg@chromium.org>
Commit-Queue: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736369}