Temporary hack to avoid PDFium crashing

I'll remove this again once PDFium has the explicit Initialize() call
as well

BUG=none
LOG=n
R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/583183002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24082 ce2b1a6d-e550-0410-aec6-3dcde31c8c00