Added Ping-From and Ping-To headers associated with <a ping>.
Added Ping-From and Ping-To headers associated with <a ping>.

The spec for <a ping> adds two new HTTP headers that may be sent with
a ping request. See
http://html.spec.whatwg.org/multipage/semantics.html#hyperlink-auditing.
-------------
Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=78456250

leesir/guava,weihungliu/guava,rcpoison/guava,cgdecker/guava,Overruler/guava-libraries,mgalushka/guava,lgscofield/guava,sarvex/guava,r4-keisuke/guava,dushmis/guava,mohanaraosv/guava,XiWenRen/guava,fengshao0907/guava,zcwease/guava-libraries,dushmis/guava,r4-keisuke/guava,dpursehouse/guava,tobecrazy/guava,leesir/guava,Akshay77/guava,aditya-chaturvedi/guava,seanli310/guava,lisb/guava,aditya-chaturvedi/guava,mway08/guava,DavesMan/guava,clcron/guava-libraries,mengdiwang/guava-libraries,RoliMG/guava,Kevin2030/guava,EdwardLee03/guava,scr/guava,tli2/guava,levenhdu/guava,kaoudis/guava,eidehua/guava,binhvu7/guava,hannespernpeintner/guava,gmaes/guava,Yijtx/guava,nulakasatish/guava-libraries,HarveyTvT/guava,ben-manes/guava,yanyongshan/guava,allalizaki/guava-libraries,jamesbrowder/guava-libraries,jsnchen/guava,easyfmxu/guava,marstianna/guava,renchunxiao/guava,google/guava,yangxu998/guava-libraries,10045125/guava,okaywit/guava-libraries,dnrajugade/guava-libraries,dmi3aleks/guava,sunbeansoft/guava,GabrielNicolasAvellaneda/guava,seanli310/guava,1yvT0s/guava,anigeorge/guava,Xaerxess/guava,elijah513/guava,RoliMG/guava,weihungliu/guava,ningg/guava,yuan232007/guava,allenprogram/guava,lisb/guava,tunzao/guava,jakubmalek/guava,KengoTODA/guava,liyazhou/guava,njucslqq/guava,DucQuang1/guava,aiyanbo/guava,Ariloum/guava,lgscofield/guava,google/guava,yigubigu/guava,levenhdu/guava,jiteshmohan/guava,fengshao0907/guava-libraries,kgislsompo/guava-libraries,yf0994/guava-libraries,mosoft521/guava,typetools/guava,SaintBacchus/guava,allenprogram/guava,sebadiaz/guava,tobecrazy/guava,Xaerxess/guava,flowbywind/guava,jedyang/guava,thinker-fang/guava,disc99/guava,mway08/guava,scr/guava,mkodekar/guava-libraries,XiWenRen/guava,xueyin87/guava-libraries,leogong/guava,maidh91/guava-libraries,paplorinc/guava,jiteshmohan/guava,gmaes/guava,renchunxiao/guava,rob3ns/guava,jamesbrowder/guava-libraries,codershamo/guava,SaintBacchus/guava,ningg/guava,licheng-xd/guava,cklsoft/guava,VikingDen/guava,abel-von/guava,rgoldberg/guava,yuan232007/guava,BollyCheng/guava,flowbywind/guava,mosoft521/guava,manolama/guava,zcwease/guava-libraries,easyfmxu/guava,aiyanbo/guava,tli2/guava,gvikei/guava-libraries,sebadiaz/guava,pwz3n0/guava,google/guava,Balzanka/guava-libraries,tailorlala/guava-libraries,paddx01/guava-src,maidh91/guava-libraries,qingsong-xu/guava,huangsihuan/guava,cogitate/guava-libraries,m3n78am/guava,jackyglony/guava,GitHub4Lgfei/guava,0359xiaodong/guava,leogong/guava,rcpoison/guava,danielnorberg/guava-libraries,huangsihuan/guava,KengoTODA/guava,GitHub4Lgfei/guava,0359xiaodong/guava,EdwardLee03/guava,1yvT0s/guava,xasx/guava,mengdiwang/guava-libraries,marstianna/guava,mgalushka/guava,uschindler/guava,ChengLong/guava,DaveAKing/guava-libraries,licheng-xd/guava,SyllaJay/guava,gvikei/guava-libraries,elijah513/guava,dpursehouse/guava,fengshao0907/guava-libraries,HarveyTvT/guava,nulakasatish/guava-libraries,fengshao0907/guava,yigubigu/guava,cklsoft/guava,mohanaraosv/guava,Balzanka/guava-libraries,montycheese/guava,dubu/guava-libraries,sunbeansoft/guava,qingsong-xu/guava,AnselQiao/guava,taoguan/guava,dnrajugade/guava-libraries,xasx/guava,Overruler/guava-libraries,mkodekar/guava-libraries,montycheese/guava,anigeorge/guava,typetools/guava,m3n78am/guava,norru/guava,yf0994/guava-libraries,kgislsompo/guava-libraries,Ranjodh-Singh/ranjodh87-guavalib,jedyang/guava,jankill/guava,monokurobo/guava,SyllaJay/guava,rgoldberg/guava,jsnchen/guava,jayhetee/guava,thinker-fang/guava,allalizaki/guava-libraries,berndhopp/guava,okaywit/guava-libraries,njucslqq/guava,chen870647924/guava-libraries,DucQuang1/guava,jayhetee/guava,liyazhou/guava,Ranjodh-Singh/ranjodh87-guavalib,Yijtx/guava,dubu/guava-libraries,pwz3n0/guava,tunzao/guava,paddx01/guava-src,xueyin87/guava-libraries,kucci/guava-libraries,ignaciotcrespo/guava,taoguan/guava,chen870647924/guava-libraries,GabrielNicolasAvellaneda/guava,cogitate/guava-libraries,jankill/guava,5A68656E67/guava,Akshay77/guava,witekcc/guava,lijunhuayc/guava,DaveAKing/guava-libraries,mosoft521/guava,clcron/guava-libraries,BollyCheng/guava,DavesMan/guava,codershamo/guava,juneJuly/guava,kaoudis/guava,Ariloum/guava,ChengLong/guava,paplorinc/guava,eidehua/guava,kingland/guava,berndhopp/guava,jakubmalek/guava,hannespernpeintner/guava,monokurobo/guava,kingland/guava,jackyglony/guava,disc99/guava,ignaciotcrespo/guava,norru/guava,yanyongshan/guava,kucci/guava-libraries,ceosilvajr/guava,tailorlala/guava-libraries,rob3ns/guava,5A68656E67/guava,lijunhuayc/guava,yangxu998/guava-libraries,sander120786/guava-libraries,sander120786/guava-libraries,manolama/guava,AnselQiao/guava,juneJuly/guava,witekcc/guava,VikingDen/guava,Kevin2030/guava,abel-von/guava