Fix compilation errors with completion callback.
Fix compilation errors with completion callback.

TEST=none
BUG=none
Review URL: http://codereview.chromium.org/2822033
YachaoLiu/ppapi,lag945/ppapi,thdtjsdn/ppapi,xiaozihui/ppapi,chenfeng8742/ppapi,tiaolong/ppapi,tiaolong/ppapi,rise-worlds/ppapi,phisixersai/ppapi,fubaydullaev/ppapi,nanox/ppapi,stefanie924/ppapi,gwobay/ppapi,stefanie924/ppapi,dralves/ppapi,cacpssl/ppapi,huochetou999/ppapi,qwop/ppapi,ruder/ppapi,dingdayong/ppapi,rise-worlds/ppapi,cacpssl/ppapi,phisixersai/ppapi,dralves/ppapi,siweilvxing/ppapi,huqingyu/ppapi,dingdayong/ppapi,whitewolfm/ppapi,CharlesHuimin/ppapi,nanox/ppapi,JustRight/ppapi,dralves/ppapi,nanox/ppapi,huqingyu/ppapi,gwobay/ppapi,tonyjoule/ppapi,c1soju96/ppapi,gwobay/ppapi,ruder/ppapi,siweilvxing/ppapi,HAfsari/ppapi,stefanie924/ppapi,YachaoLiu/ppapi,qwop/ppapi,xiaozihui/ppapi,qwop/ppapi,siweilvxing/ppapi,tiaolong/ppapi,YachaoLiu/ppapi,xinghaizhou/ppapi,tonyjoule/ppapi,siweilvxing/ppapi,JustRight/ppapi,xiaozihui/ppapi,fubaydullaev/ppapi,dingdayong/ppapi,nanox/ppapi,huochetou999/ppapi,xiaozihui/ppapi,xuesongzhu/ppapi,xiaozihui/ppapi,c1soju96/ppapi,xinghaizhou/ppapi,HAfsari/ppapi,huqingyu/ppapi,siweilvxing/ppapi,dralves/ppapi,stefanie924/ppapi,huochetou999/ppapi,lag945/ppapi,chenfeng8742/ppapi,dralves/ppapi,lag945/ppapi,Xelemsta/ppapi,dingdayong/ppapi,dingdayong/ppapi,lag945/ppapi,c1soju96/ppapi,HAfsari/ppapi,fubaydullaev/ppapi,phisixersai/ppapi,huochetou999/ppapi,tonyjoule/ppapi,CharlesHuimin/ppapi,whitewolfm/ppapi,cacpssl/ppapi,chenfeng8742/ppapi,xuesongzhu/ppapi,phisixersai/ppapi,cacpssl/ppapi,thdtjsdn/ppapi,c1soju96/ppapi,thdtjsdn/ppapi,HAfsari/ppapi,whitewolfm/ppapi,rise-worlds/ppapi,gwobay/ppapi,qwop/ppapi,xinghaizhou/ppapi,Xelemsta/ppapi,phisixersai/ppapi,JustRight/ppapi,CharlesHuimin/ppapi,thdtjsdn/ppapi,cacpssl/ppapi,xinghaizhou/ppapi,Xelemsta/ppapi,rise-worlds/ppapi,xuesongzhu/ppapi,JustRight/ppapi,fubaydullaev/ppapi,whitewolfm/ppapi,nanox/ppapi,ruder/ppapi,xuesongzhu/ppapi,ruder/ppapi,chenfeng8742/ppapi,lag945/ppapi,huochetou999/ppapi,huqingyu/ppapi,tonyjoule/ppapi,gwobay/ppapi,huqingyu/ppapi,chenfeng8742/ppapi,HAfsari/ppapi,CharlesHuimin/ppapi,YachaoLiu/ppapi,CharlesHuimin/ppapi,tiaolong/ppapi,JustRight/ppapi,Xelemsta/ppapi,Xelemsta/ppapi,xinghaizhou/ppapi,tiaolong/ppapi,c1soju96/ppapi,xuesongzhu/ppapi,thdtjsdn/ppapi,ruder/ppapi,rise-worlds/ppapi,fubaydullaev/ppapi,qwop/ppapi,stefanie924/ppapi,tonyjoule/ppapi,YachaoLiu/ppapi,whitewolfm/ppapi