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This patch means remove tracing to make IndexedDB
(and more importantly, compaction) faster.

Bug: 1012883
Change-Id: I0f05171ecf8986d8cccdc151243e1de02d124090
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1851365
Commit-Queue: Daniel Murphy <dmurph@chromium.org>
Reviewed-by: Daniel Murphy <dmurph@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704918}