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This reverts commit 4aaa9f29.

As Flash's deprecation is near, we are resuming per session prompting about the deprecation.

Bug: 995969
Change-Id: I76632c2ace65d95fafaaea9224f02586f53c6841
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2390656
Commit-Queue: Ravjit Singh Uppal <ravjit@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805443}