linux: unwrap nspluginwrapper-wrapped plugins if possible
linux: unwrap nspluginwrapper-wrapped plugins if possible

Since we already run plugins out of process, nspluginwrapper is just
an extra source of problems.  We'll still use nspluginwrapper when it's
necessary, e.g. to run 32-bit plugins on a 64-bit computer.

Review URL: http://codereview.chromium.org/998006

git-svn-id: http://src.chromium.org/svn/trunk/src@41999 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 6c8aec6db2367c8142916809b2482cc542d8dc04
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser