Add check for NaCl being enabled which got lost in my refactoring of the PluginRegistry and is likely the cause of the startup regressions.
Add check for NaCl being enabled which got lost in my refactoring of the
PluginRegistry and is likely the cause of the startup regressions.

Review URL: http://codereview.chromium.org/6413011

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@73944 0039d316-1c4b-4281-b951-d872f2087c98

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