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Crash can be triggered from login screen when any paste is performed and
ClipboardNudgeController::OnClipboardDataRead is called. So add a check
to see that the clipboard history is enabled in the current mode.

Also possible is that ClipboardNudgeController::ShouldShowNudge() is
passed a null PrefService*. So add a check for this being null, as well
as some checks for null dictionaries.

Bug: 1150168
Change-Id: I79e407f3896408af7a44aacf31f15d290c2629c6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2546085
Commit-Queue: Matthew Mourgos <mmourgos@chromium.org>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828866}