When finding the navigation entry for updating the title, we should use the site instance from the RVH that is updating the title rather than the current one. The current one might be a different process, which has a different page_id namespace and could cause us to get confused.
When finding the navigation entry for updating the title, we should use the
site instance from the RVH that is updating the title rather than the current
one. The current one might be a different process, which has a different
page_id namespace and could cause us to get confused.

If we get the page ID from the renderer, we should use the SiteInstance from
the same one rather than getting it from somewhere else. I don't know exactly
what case this might happen in, I just noticed this big via inspection when
looking at the code.

TEST=none
BUG=none
Review URL: http://codereview.chromium.org/3228007

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@58179 0039d316-1c4b-4281-b951-d872f2087c98

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