linux: Don't crash if we fail to dlopen a plugin
linux: Don't crash if we fail to dlopen a plugin

Review URL: http://codereview.chromium.org/146073
Patch from Antoine Labour <piman@google.com>.

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@19554 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser