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Includes one behavioral change, no longer disabling the ability to paste
via keyboard shortcuts when the clipboard is empty. This change
simplifies the code, reducing the number of points of access to the
clipboard and removing the need for an auto-reset bool to control
whether the user is notified of restricted clipboard access. The removal
of the auto-reset bool is especially important as the scope-exiting
reset will always cause a memory access even if the view has been
deleted.

Bug: 1161149
Change-Id: I7a494c534e0efbf5d762a58fe6f7f39591cebb80
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2619204
Commit-Queue: Justin Donnelly <jdonnelly@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: manuk hovanesian <manukh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843159}