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Currently we use NavigationRequest's CommitNavigationParams' method in
VerifyThatBrowserAndRendererCalculatedDidCommitParamsMatch, but that
might differ than what the renderer returns on history same-document
navigations due to the history API resetting methods to "GET".

For POST ID, we use the last committed entry's POST ID on same-document
navigations, but that will only work for main frame cases. We need to
track the post ID directly in the RenderFrameHostImpl to cover cases
with subframe navigations.

This CL fixes the calculated values, and adds additional logging.

Bug: 1155414
Change-Id: I81358e641b7b3aaeda7fbcec58c92cef97ba9d27
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2576878
Commit-Queue: Rakina Zata Amni <rakina@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835129}