PPAPI: Add #define for PRId32 compatible with untrusted NaCl build.
PPAPI: Add #define for PRId32 compatible with untrusted NaCl build.

Review URL: http://codereview.chromium.org/3244004
LinRaise/ppapi,iofcas/ppapi,Gitzk/ppapi,iofcas/ppapi,LinRaise/ppapi,jmnjmn/ppapi,lio972/ppapi,thecocce/ppapi,LinRaise/ppapi,Gitzk/ppapi,johnnnylm/ppapi,melchi45/ppapi,LinRaise/ppapi,Gitzk/ppapi,kaijajan/ppapi,iofcas/ppapi,melchi45/ppapi,Iwan12/ppapi,humanai/ppapi,melchi45/ppapi,Iwan12/ppapi,humanai/ppapi,jmnjmn/ppapi,humanai/ppapi,lio972/ppapi,humanai/ppapi,thecocce/ppapi,Iwan12/ppapi,Iwan12/ppapi,lio972/ppapi,LinRaise/ppapi,iofcas/ppapi,macressler/ppapi,kaijajan/ppapi,thecocce/ppapi,macressler/ppapi,jmnjmn/ppapi,kaijajan/ppapi,lio972/ppapi,Gitzk/ppapi,jmnjmn/ppapi,macressler/ppapi,johnnnylm/ppapi,thecocce/ppapi,jmnjmn/ppapi,macressler/ppapi,johnnnylm/ppapi,johnnnylm/ppapi,macressler/ppapi,kaijajan/ppapi,johnnnylm/ppapi,Gitzk/ppapi,iofcas/ppapi,humanai/ppapi,melchi45/ppapi,Iwan12/ppapi,thecocce/ppapi,lio972/ppapi,kaijajan/ppapi,melchi45/ppapi