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This allows us to round-trip from PepperPluginInfo to WebPluginInfo and back. This happens in the component updater when it registers Flash.

BUG=138902


Review URL: https://chromiumcodereview.appspot.com/10831224

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150922 0039d316-1c4b-4281-b951-d872f2087c98