Bug 1758809 [wpt PR 33141] - Fire popstate for navigations intercepted by appHistory...

Bug 1758809 [wpt PR 33141] - Fire popstate for navigations intercepted by appHistory.transitionWhile(), a=testonly

Automatic update from web-platform-tests
Fire popstate for navigations intercepted by appHistory.transitionWhile()

Currently the logic for firing popstate lives in
FrameLoader::DidFinishSameDocumentNavigation, which is only fired for
fragment navigations (including back/forward ones). This CL moves it
to DocumentLoader::UpdateForSameDocumentNavigaiton (which is called for
all same-document navigations).

Now that FrameLoader::DidFinishSameDocumentNavigation only handles
scrolling behavior (scroll restore and fragment processing), rename it
to ProcessScrollForSameDocumentNavigation.

Change-Id: I103cdf7fb7407bc8c35f13133cd8dfec1aab5421
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3514480
Reviewed-by: Domenic Denicola <domenic@chromium.org>
Commit-Queue: Nate Chapin <japhet@chromium.org>
Cr-Commit-Position: refs/heads/main@{#979984}

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wpt-commits: 65340bb1a3e071839f35b20f9c2146c8d1df2e82
wpt-pr: 33141