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We only need to call this method during main frame navigation.

TBR=apacible@chromium.org

Bug: 893850
Change-Id: Id78fb02440f646c07de9bec3460cbb64809781f1
Reviewed-on: https://chromium-review.googlesource.com/c/1340702
Commit-Queue: Saman Sami <samans@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609493}