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base::ProtectedMemory is being deprecated because it's not widely used
enough to make a security impact and justify its maintenance burden.
All uses of base::ProtectedMemory have already been removed, now delete
the remaining code and build changes.

Bug: 1018834, 1007916
Change-Id: I2df8d6d30d3ccfa7e8fb679d047e9df02539ff49
Fixes: 1018834, 1007916
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1891114
Auto-Submit: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711546}