go.mobile/bind/java: update javatest.go to build.
go.mobile/bind/java: update javatest.go to build.

LGTM=crawshaw
R=crawshaw
CC=golang-codereviews
https://golang.org/cl/171850043

lonphy23t/mobile,cainiaocome/mobile,freeman0211/mobile,zach-klippenstein/mobile,lonphy23t/mobile,xing/gomobile,b54898533/mobile,b54898533/mobile,steeve/mobile,steeve/mobile,swisspol/mobile,ichu501/mobile,golang/mobile,tempbottle/mobile,xing/gomobile,grategames/mobile,tempbottle/mobile,ppamorim/mobile,cainiaocome/mobile,samanalysis/mobile,b54898533/mobile,0x90sled/mobile,ppamorim/mobile,cainiaocome/mobile,samanalysis/mobile,goldcaddy77/mobile,grategames/mobile,tempbottle/mobile,tempbottle/mobile,cainiaocome/mobile,goldcaddy77/mobile,steeve/mobile,0x90sled/mobile,xing/gomobile,goldcaddy77/mobile,MaxCy330/mobile,0x90sled/mobile,cainiaocome/mobile,zach-klippenstein/mobile,ichu501/mobile,swisspol/mobile,tempbottle/mobile,0x90sled/mobile,freeman0211/mobile,swisspol/mobile,goldcaddy77/mobile,DanielWorld/mobile,golang/mobile,MaxCy330/mobile,swisspol/mobile,qskycolor/mobile,DanielWorld/mobile,0x90sled/mobile,freeman0211/mobile,xing/gomobile,xing/gomobile,lonphy23t/mobile,golang/mobile,grategames/mobile,lonphy23t/mobile,goldcaddy77/mobile,MaxCy330/mobile,MaxCy330/mobile,qskycolor/mobile,ichu501/mobile,golang/mobile,ichu501/mobile,steeve/mobile,freeman0211/mobile,lonphy23t/mobile,qskycolor/mobile,b54898533/mobile,ppamorim/mobile,ichu501/mobile,samanalysis/mobile,MaxCy330/mobile,qskycolor/mobile,DanielWorld/mobile,swisspol/mobile,DanielWorld/mobile,b54898533/mobile,zach-klippenstein/mobile,ppamorim/mobile,samanalysis/mobile,ppamorim/mobile,samanalysis/mobile,zach-klippenstein/mobile,grategames/mobile