Add checks for Mac plugin instance destruction after NPP_* calls
Add checks for Mac plugin instance destruction after NPP_* calls

BUG=35856
TEST=none

Review URL: http://codereview.chromium.org/609003

git-svn-id: http://src.chromium.org/svn/trunk/src@39138 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 5dcdb86f03f263a40d465299aed566de7239c1da
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