WebNavigationApi: Remove unused function.

Remove FrameNavigationState::UpdateFrame. This function is not used.

Bug: None.
Change-Id: I59eb69494add5a3e0845a266bbff0af09475f9b4
Reviewed-on: https://chromium-review.googlesource.com/c/1280423
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599900}
2 files changed