Fix for pdf plugin not loaded in the linux sandbox.
Fix for pdf plugin not loaded in the linux sandbox.

BUG=none
TEST=Run linux Chrome with sandbox and verify internal PDF viewer displaying PDFs.

Review URL: http://codereview.chromium.org/3081013

git-svn-id: http://src.chromium.org/svn/trunk/src@54986 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 57827589781fb2d8ca4f34c4a6be2fb40f5d5ed4
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