Fix pepper plugin description regression
Fix pepper plugin description regression

CL http://codereview.chromium.org/6162008 broke descriptions for pepper plugins.
This puts it back to the previous state (we don't have a way to separately give
mime type descriptions vs plugin descriptions)

BUG=cros:11298
TEST=Flash on CNN

Review URL: http://codereview.chromium.org/6327019

git-svn-id: http://src.chromium.org/svn/trunk/src@72569 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: daeb3749ee9adaf016c288548da8f907e0e670a3
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