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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 the print dialog navigation test that
previously didn't expect a change of RenderFrameHosts etc. on same-site
navigations - we're now changing the test to do a same document
navigation (which is what GMail is doing).

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

Bug: 977562
Change-Id: Ifeb972f92f86d45385545f84d27d53784d7abe89
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2212287
Commit-Queue: Rakina Zata Amni <rakina@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772045}