NavigationPredictor: Remove anchors in detached subframes We currently report anchors inserted into local subframes using the main frame's AnchorElementMetricsSender (after crrev.com/c/5252328). We don't however report when the anchors are removed when the iframe is removed or navigates (HTMLAnchorElement::RemovedFrom isn't called in that case). This CL adds logic to listen to subframe document detaches (that are not caused by the main frame detaching/navigating), and reports the anchors in the document as removed to the browser. Bug: 40946912 Change-Id: I86a2f6357bb0fa1c1d25d416af1ec9001a2a4e84 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5721450 Reviewed-by: Kevin McNee <mcnee@chromium.org> Commit-Queue: Adithya Srinivasan <adithyas@chromium.org> Reviewed-by: Jeremy Roman <jbroman@chromium.org> Cr-Commit-Position: refs/heads/main@{#1331985}
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