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Many websites rely on same doc navigation to render
different views using pushState/replaceState API, which
was originally not considered to unelide URL.
This CL enables uneliding for same document navigations
with the following considerations:
- If the same doc navigation is just a fragment navigation
(e.g.) from /foo to /foo#bar, URL should remain in its
initial state.
- If the same doc navigation is not a fragment navigation
(e.g.) from /foo to /foo/bar, URL should be unelided.
Also, added tests to check both scenarios, including
GetPreviousURL mock in the mock_navigation_handle.

Bug: 1096160
Change-Id: Ic051699c9fdb34eaa16e0c586672aae6d8d98b9b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2335675Reviewed-by: Tommy Li <tommycli@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Emily Stark <estark@chromium.org>
Commit-Queue: Ernesto García <ernestognw@google.com>
Cr-Commit-Position: refs/heads/master@{#794869}