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This reverts commit 02979f89.

Reason for revert: Causing failures on linux-xenial-rel bot:

https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/linux-xenial-rel/6075

Original change's description:
> Reland "Migrate AdsPageLoadMetricsObserver to ResourceDataUse over OnLoadedResource"
> 
> 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}

TBR=jkarlin@chromium.org,rsesek@chromium.org,johnidel@chromium.org

Change-Id: Ia755a547df8982402942b3430e6680ed1e97f3a2
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 878393
Reviewed-on: https://chromium-review.googlesource.com/c/1394949Reviewed-by: Tommy Steimel <steimel@chromium.org>
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619789}