linux: defend against "netscape" within plugin path
linux: defend against "netscape" within plugin path

Flash misbehaves if you load it from a path containing "netscape",
so we try to avoid and warn the user if necessary.

BUG=20758,21900

Review URL: http://codereview.chromium.org/206009

git-svn-id: http://src.chromium.org/svn/trunk/src@26265 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 95f8c6c2c16ae47865d7902145cc51a0a34b232b
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