ChromeOS PDF handling: if the built-in PDF viewer plug-in is active, don't intercept PDF opening and forward to gView, but use the plug-in instead.
ChromeOS PDF handling: if the built-in PDF viewer plug-in is active, don't intercept PDF opening and forward to gView, but use the plug-in instead.

BUG=chromium-os:4790
TEST=none

Review URL: http://codereview.chromium.org/2906010

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@52770 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