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With crrev.com/c/2121522, some main-frame same-site navigations will
result in a new BrowsingInstance, SiteInstance, RenderFrameHost,
RenderView, etc. This CL updates expectations of
credential_manager_browsertest that didn't expect a change of
RenderFrameHosts etc. on same-site navigations.

This CL does not include fixes for other tests in chrome/ content/,
components/, and layout tests (they're fixed in other CLs)

For more details, see doc: https://docs.google.com/document/d/1lHdkKLUe8H6ZP6ALwj-dsus7oYcuc93HkSCHCcerItg/edit?usp=sharing

Bug: 977562
Change-Id: Ic173f44e71305a76939aa25e1c856e7d4ce3956c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2212106Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Commit-Queue: Rakina Zata Amni <rakina@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771665}