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Notable changes:
 - Record pending URL for chrome://inducebrowsercrashforrealz
   to distinguish self inflicted UTEs
 - Extend PreviousSessionInfo to store navigation URLs
 - PreviousSessionInfo only stores URL origins as requested
   by Privacy team
 - Use URLs from PreviousSessionInfo for synthetic crash reports

Bug: 1103752
Change-Id: Idbde05b634e840fe377c4803b357fbef03c36170
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2451298
Commit-Queue: Eugene But <eugenebut@chromium.org>
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Auto-Submit: Eugene But <eugenebut@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814360}