When determining that two plugins are the same but of different versions, make sure that they share at least one mime type.
When determining that two plugins are the same but of different versions, make sure that they share at least one mime type.

BUG=43037
Review URL: http://codereview.chromium.org/1844001

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@46242 0039d316-1c4b-4281-b951-d872f2087c98

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