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Currently uninitialized and would cause a segfault if any clients
attempted to observe memory usage.

Bug: 1128204
Change-Id: I3bb584aa4d69f142dea93372c3322be27b528bb0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2518116Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Commit-Queue: Zentaro Kavanagh <zentaro@chromium.org>
Commit-Queue: Bailey Berro <baileyberro@chromium.org>
Auto-Submit: Bailey Berro <baileyberro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823729}