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The FrameHostInterceptor observe RenderFrameHost creation and
destruction. In its constructor, it simulate observing RenderFrameHost
creation for every active RenderFrameHost. It misses the ones in the
BackForwardCache. This causes a mismatch later when it observe a
RenderFrameHost deletion.

Change-Id: Ifabf5eab92f3275d71e5a7d760f44e4178e00d6a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1816509
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705020}