Change AllSources to AllBrowserContextsAndSources in site_instance.cc, as these usages are safe for multi-profiles.
Change AllSources to AllBrowserContextsAndSources in site_instance.cc, as these usages are safe for multi-profiles.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/8313009

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@105806 0039d316-1c4b-4281-b951-d872f2087c98

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