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This reverts commit f5d2f7eb.

Reason for revert: Suspected cause of crbug.com/1137028

Original change's description:
> Add metrics for thumbnail memory usage
>
> Adds two metrics logged every 5 minutes:
> * Per-thumbnail compressed data memory usage
> * Total compressed data memory usage
>
> The former has a sample for each thumbnail every 5 minutes, while the
> latter has exactly one every 5 minutes.
>
> Bug: 11261624
> Change-Id: I1595c6a6b771f73e3be9a5497d1cf6f6ec3d1af7
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2462685
> Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
> Reviewed-by: Dana Fried <dfried@chromium.org>
> Commit-Queue: Collin Baker <collinbaker@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#815714}

TBR=rkaplow@chromium.org,dfried@chromium.org,collinbaker@chromium.org

Change-Id: I3c0532e5653c3240715a17c00b9aec69bc323e38
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 11261624, 1137028
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2463488Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815795}