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Previously, this test was based on whether the Me2Me host
plugin was loaded. But if Native Messaging is supported, this
NPAPI instance will not get loaded, so the Share button test
should not depend on it.


BUG=173509
NOTRY=true

Review URL: https://chromiumcodereview.appspot.com/15017006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@198812 0039d316-1c4b-4281-b951-d872f2087c98