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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 view_source tests
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: Idc7b35c7cb01bacdcc0c13b083b2263b3a07dd14
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2212225
Commit-Queue: Rakina Zata Amni <rakina@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#775057}