All a11y methods in RenderFrameHost should check if the host is active before proceeding
When a RenderFrameHost is being swapped out, it will be in the process of being deleted. Before any requests from accessibility should be serviced, we should check if the RenderFrameHost is not being swapped out. Otherwise, parts of the class instance, such as its RenderViewHost, might have been destroyed, or the renderer associated with the RenderFrameHost instance might not be able to receive IPCs. R=dmazzoni@chromium.org Change-Id: I08a87cad7b789f0752adbcc1564b748456d5d338 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1881324Reviewed-by:Dominic Mazzoni <dmazzoni@chromium.org> Reviewed-by:
Avi Drissman <avi@chromium.org> Commit-Queue: Nektarios Paisios <nektar@chromium.org> Cr-Commit-Position: refs/heads/master@{#709917}
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