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Given that DISALLOW_COPY_AND_ASSIGN is deprecated, using explicit
deletions instead.

Bug: 1043306
Change-Id: I1999fb65ef08d5ba89ce296f1a72504285b4c7b6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2424659
Commit-Queue: Olivier Yiptong <oyiptong@chromium.org>
Auto-Submit: Olivier Yiptong <oyiptong@chromium.org>
Reviewed-by: Joshua Bell <jsbell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809991}