add PP_MakeCCB macro as an alias for PP_MakeCompletionCallback
add PP_MakeCCB macro as an alias for PP_MakeCompletionCallback

reuben/freshplayerplugin,grevutiu-gabriel/freshplayerplugin,Papapashu/freshplayerplugin,Papapashu/freshplayerplugin,Papapashu/freshplayerplugin,reuben/freshplayerplugin,reuben/freshplayerplugin,grevutiu-gabriel/freshplayerplugin