Add a static_cast to eliminate the build breakage on NativeClient caused by moving the #defines up.
Add a static_cast to eliminate the build breakage on NativeClient caused by
moving the #defines up.

Review URL: http://codereview.chromium.org/3402017
melchi45/ppapi,kaijajan/ppapi,thecocce/ppapi,Gitzk/ppapi,jmnjmn/ppapi,johnnnylm/ppapi,johnnnylm/ppapi,Gitzk/ppapi,humanai/ppapi,johnnnylm/ppapi,kaijajan/ppapi,Gitzk/ppapi,iofcas/ppapi,humanai/ppapi,Gitzk/ppapi,johnnnylm/ppapi,lio972/ppapi,lio972/ppapi,Iwan12/ppapi,Iwan12/ppapi,Iwan12/ppapi,LinRaise/ppapi,humanai/ppapi,melchi45/ppapi,iofcas/ppapi,iofcas/ppapi,lio972/ppapi,kaijajan/ppapi,thecocce/ppapi,johnnnylm/ppapi,LinRaise/ppapi,humanai/ppapi,iofcas/ppapi,jmnjmn/ppapi,macressler/ppapi,LinRaise/ppapi,iofcas/ppapi,kaijajan/ppapi,Iwan12/ppapi,humanai/ppapi,jmnjmn/ppapi,thecocce/ppapi,LinRaise/ppapi,kaijajan/ppapi,LinRaise/ppapi,lio972/ppapi,thecocce/ppapi,thecocce/ppapi,lio972/ppapi,jmnjmn/ppapi,macressler/ppapi,jmnjmn/ppapi,Gitzk/ppapi,melchi45/ppapi,melchi45/ppapi,macressler/ppapi,macressler/ppapi,melchi45/ppapi,macressler/ppapi,Iwan12/ppapi