Fix GCC warning about union initializer requiring {}s.
Fix GCC warning about union initializer requiring {}s.

TBR=brettw
BUG=none
TEST=none

Review URL: http://codereview.chromium.org/2080010
phisixersai/ppapi,nanox/ppapi,lag945/ppapi,xuesongzhu/ppapi,cacpssl/ppapi,gwobay/ppapi,chenfeng8742/ppapi,tiaolong/ppapi,nanox/ppapi,rise-worlds/ppapi,xinghaizhou/ppapi,fubaydullaev/ppapi,siweilvxing/ppapi,gwobay/ppapi,fubaydullaev/ppapi,huochetou999/ppapi,c1soju96/ppapi,dingdayong/ppapi,HAfsari/ppapi,YachaoLiu/ppapi,whitewolfm/ppapi,xiaozihui/ppapi,siweilvxing/ppapi,thdtjsdn/ppapi,Xelemsta/ppapi,thdtjsdn/ppapi,thdtjsdn/ppapi,rise-worlds/ppapi,nanox/ppapi,Xelemsta/ppapi,whitewolfm/ppapi,lag945/ppapi,qwop/ppapi,xiaozihui/ppapi,ruder/ppapi,nanox/ppapi,HAfsari/ppapi,thdtjsdn/ppapi,nanox/ppapi,phisixersai/ppapi,xuesongzhu/ppapi,dralves/ppapi,huochetou999/ppapi,rise-worlds/ppapi,siweilvxing/ppapi,tiaolong/ppapi,tiaolong/ppapi,xinghaizhou/ppapi,fubaydullaev/ppapi,thdtjsdn/ppapi,xinghaizhou/ppapi,siweilvxing/ppapi,stefanie924/ppapi,ruder/ppapi,JustRight/ppapi,HAfsari/ppapi,ruder/ppapi,stefanie924/ppapi,CharlesHuimin/ppapi,xiaozihui/ppapi,huochetou999/ppapi,chenfeng8742/ppapi,huochetou999/ppapi,tonyjoule/ppapi,YachaoLiu/ppapi,chenfeng8742/ppapi,Xelemsta/ppapi,tiaolong/ppapi,chenfeng8742/ppapi,CharlesHuimin/ppapi,dingdayong/ppapi,phisixersai/ppapi,HAfsari/ppapi,stefanie924/ppapi,xiaozihui/ppapi,fubaydullaev/ppapi,qwop/ppapi,cacpssl/ppapi,c1soju96/ppapi,ruder/ppapi,huqingyu/ppapi,gwobay/ppapi,Xelemsta/ppapi,huqingyu/ppapi,rise-worlds/ppapi,JustRight/ppapi,dralves/ppapi,siweilvxing/ppapi,ruder/ppapi,rise-worlds/ppapi,stefanie924/ppapi,CharlesHuimin/ppapi,xuesongzhu/ppapi,qwop/ppapi,JustRight/ppapi,lag945/ppapi,tiaolong/ppapi,qwop/ppapi,c1soju96/ppapi,HAfsari/ppapi,qwop/ppapi,tonyjoule/ppapi,c1soju96/ppapi,xuesongzhu/ppapi,tonyjoule/ppapi,CharlesHuimin/ppapi,CharlesHuimin/ppapi,Xelemsta/ppapi,cacpssl/ppapi,gwobay/ppapi,tonyjoule/ppapi,huqingyu/ppapi,whitewolfm/ppapi,JustRight/ppapi,dingdayong/ppapi,fubaydullaev/ppapi,cacpssl/ppapi,c1soju96/ppapi,huochetou999/ppapi,dralves/ppapi,whitewolfm/ppapi,dingdayong/ppapi,dralves/ppapi,huqingyu/ppapi,YachaoLiu/ppapi,lag945/ppapi,dralves/ppapi,tonyjoule/ppapi,xinghaizhou/ppapi,gwobay/ppapi,YachaoLiu/ppapi,huqingyu/ppapi,stefanie924/ppapi,xinghaizhou/ppapi,cacpssl/ppapi,YachaoLiu/ppapi,lag945/ppapi,phisixersai/ppapi,dingdayong/ppapi,JustRight/ppapi,xuesongzhu/ppapi,whitewolfm/ppapi,xiaozihui/ppapi,phisixersai/ppapi,chenfeng8742/ppapi