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This reverts commit 2412286a.

Reason for revert: Soon after this CL PageLoadMetricsBrowserTest.UseCounterFeaturesInNonSecureMainFrame and some other PageLoadMetricsBrowserTest* tests became flaky.

Original change's description:
> Propagate main frame document dimensions through frame intersections.
> 
> This change calls OnMainFrameDocumentIntersectionChanged for the main
> frame. The RenderFrame resets the main frame's intersection when the
> frame commits a navigation to ensure we propagate a new intersection
> for each committed navigation (otherwise we may lose updates when the
> render frame observer propagates values for uncommitted loads to
> page load metrics).
> 
> This allows consumers to compare frame intersections with the main
> frame's rect. This is a precursor to measuring page ad density.
> 
> BUG=993453
> 
> Change-Id: I689505c086ed0216af9f216ed4dd3d13f9c3ec1d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2105622
> Commit-Queue: Justin Miron <justinmiron@google.com>
> Reviewed-by: Robert Sesek <rsesek@chromium.org>
> Reviewed-by: John Delaney <johnidel@chromium.org>
> Reviewed-by: Stefan Zager <szager@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#754626}

TBR=szager@chromium.org,rsesek@chromium.org,johnidel@chromium.org,justinmiron@google.com

Change-Id: I560698131b66fc9cb2b6a33737ffde2016cd5636
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 993453, 1066455
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2129533Reviewed-by: Michael Ershov <miersh@google.com>
Commit-Queue: Michael Ershov <miersh@google.com>
Cr-Commit-Position: refs/heads/master@{#754894}