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According to Session.WebStates.NavigationItem.SerializedURLSize and
Session.WebStates.NavigationItem.SerializedReferrerURLSize histograms
stored URLs might be very long, which can have negative impact on
stability.

InvalidUrlTabHelper will not allow navigations to URLs longer than
kMaxURLChars, so there is no point in storing navigation items with
such long URLs. InvalidUrlTabHelper depends on UseJSForErrorPage flag
and will be enabled some time this fall.

Bug: 1082279
Change-Id: I2839bc6fbe8a1335c710e6afe28352f0f886698b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2324724Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Ali Juma <ajuma@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792737}