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This is a reland of 7c6d18ba

Original change's description:
> Migrate AdsPageLoadMetricsObserver to ResourceDataUse over OnLoadedResource
>
> This CL is strictly a refactor that switches the Ads PLMO to count frame
> data using ResourceDataUseUpdate instead of OnLoadedResource. This will
> allow us to include incomplete resources and header bytes in future
> per-frame metrics. This will not change behavior of existing histograms
> at all.
>
> Bug: 878393
> Change-Id: Ibb235c11bbaa168a40be51bc99c03a0ba999c251
> Reviewed-on: https://chromium-review.googlesource.com/c/1372428
> Commit-Queue: John Delaney <johnidel@chromium.org>
> Reviewed-by: Robert Sesek <rsesek@chromium.org>
> Reviewed-by: Josh Karlin <jkarlin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#619436}

TBR=rsesek@chromium.org

Bug: 878393
Change-Id: I9c8760497d2a5110f4bae31d633d82a405ed812a
Reviewed-on: https://chromium-review.googlesource.com/c/1393530
Commit-Queue: John Delaney <johnidel@chromium.org>
Reviewed-by: Josh Karlin <jkarlin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619760}