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We should clear these maps on every navigation to keep them from growing
unbounded, and because its safe to clear this state after a navigation.

R=ericrk@chromium.org

Bug: 1003886
Change-Id: I68dae1d564039c27795e63ac18144ea955bac8ad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1804515
Commit-Queue: Khushal <khushalsagar@chromium.org>
Auto-Submit: Khushal <khushalsagar@chromium.org>
Reviewed-by: Eric Karl <ericrk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697477}