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This is necessitated by Navigation not having const functions. It would be
nice for Navigation to have const functions, but that isn't possible because
we generally don't have const functions in content.

BUG=none
TEST=none

Change-Id: I57f7385730e0eca623d8762512fff8403699c779
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1779002Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#692175}