Set browser.process.leader to true
Set browser.process.leader to true

By default, the child process does not create a new process group. This means there's no guarantee that the entire process tree will die when the child process is killed. To solve this:
process = ChildProcess.build(*args)
process.leader = true
process.start

Signed-off-by: Alex Rodionov <c428fb87124f61eee6b049825877188ec2bd38d3@gmail.com>

valfirst/selenium,DrMarcII/selenium,krmahadevan/selenium,DrMarcII/selenium,jsakamoto/selenium,xmhubj/selenium,tbeadle/selenium,markodolancic/selenium,joshmgrant/selenium,tbeadle/selenium,kalyanjvn1/selenium,chrisblock/selenium,HtmlUnit/selenium,dibagga/selenium,joshbruning/selenium,xsyntrex/selenium,markodolancic/selenium,bayandin/selenium,titusfortner/selenium,Tom-Trumper/selenium,xmhubj/selenium,titusfortner/selenium,valfirst/selenium,titusfortner/selenium,gurayinan/selenium,mach6/selenium,lmtierney/selenium,xsyntrex/selenium,HtmlUnit/selenium,Dude-X/selenium,joshmgrant/selenium,GorK-ChO/selenium,jsakamoto/selenium,krmahadevan/selenium,oddui/selenium,HtmlUnit/selenium,valfirst/selenium,valfirst/selenium,joshmgrant/selenium,joshmgrant/selenium,Ardesco/selenium,Tom-Trumper/selenium,SeleniumHQ/selenium,mojwang/selenium,Jarob22/selenium,valfirst/selenium,SeleniumHQ/selenium,asolntsev/selenium,5hawnknight/selenium,asashour/selenium,chrisblock/selenium,Ardesco/selenium,mach6/selenium,joshbruning/selenium,kalyanjvn1/selenium,DrMarcII/selenium,oddui/selenium,xmhubj/selenium,valfirst/selenium,SeleniumHQ/selenium,joshbruning/selenium,joshbruning/selenium,xmhubj/selenium,SeleniumHQ/selenium,xsyntrex/selenium,kalyanjvn1/selenium,mach6/selenium,oddui/selenium,carlosroh/selenium,5hawnknight/selenium,davehunt/selenium,titusfortner/selenium,Dude-X/selenium,SeleniumHQ/selenium,Dude-X/selenium,5hawnknight/selenium,SeleniumHQ/selenium,Jarob22/selenium,gurayinan/selenium,titusfortner/selenium,valfirst/selenium,Jarob22/selenium,mojwang/selenium,lmtierney/selenium,carlosroh/selenium,tbeadle/selenium,davehunt/selenium,xsyntrex/selenium,joshmgrant/selenium,bayandin/selenium,kalyanjvn1/selenium,joshmgrant/selenium,joshmgrant/selenium,juangj/selenium,Dude-X/selenium,lmtierney/selenium,bayandin/selenium,jsakamoto/selenium,carlosroh/selenium,lmtierney/selenium,dibagga/selenium,HtmlUnit/selenium,tbeadle/selenium,jabbrwcky/selenium,jabbrwcky/selenium,asolntsev/selenium,xmhubj/selenium,gurayinan/selenium,krmahadevan/selenium,jabbrwcky/selenium,DrMarcII/selenium,mach6/selenium,chrisblock/selenium,bayandin/selenium,mojwang/selenium,jabbrwcky/selenium,asashour/selenium,mojwang/selenium,juangj/selenium,mach6/selenium,carlosroh/selenium,dibagga/selenium,valfirst/selenium,xmhubj/selenium,jsakamoto/selenium,bayandin/selenium,gurayinan/selenium,jabbrwcky/selenium,chrisblock/selenium,tbeadle/selenium,dibagga/selenium,krmahadevan/selenium,davehunt/selenium,5hawnknight/selenium,juangj/selenium,tbeadle/selenium,juangj/selenium,juangj/selenium,mach6/selenium,GorK-ChO/selenium,xmhubj/selenium,xmhubj/selenium,mojwang/selenium,Tom-Trumper/selenium,dibagga/selenium,twalpole/selenium,SeleniumHQ/selenium,carlosroh/selenium,kalyanjvn1/selenium,Dude-X/selenium,Dude-X/selenium,carlosroh/selenium,asolntsev/selenium,mach6/selenium,GorK-ChO/selenium,Dude-X/selenium,markodolancic/selenium,xsyntrex/selenium,chrisblock/selenium,jabbrwcky/selenium,twalpole/selenium,dibagga/selenium,HtmlUnit/selenium,asashour/selenium,Dude-X/selenium,lmtierney/selenium,Ardesco/selenium,krmahadevan/selenium,asashour/selenium,5hawnknight/selenium,Tom-Trumper/selenium,markodolancic/selenium,carlosroh/selenium,xmhubj/selenium,xsyntrex/selenium,krmahadevan/selenium,HtmlUnit/selenium,bayandin/selenium,asashour/selenium,juangj/selenium,lmtierney/selenium,asashour/selenium,markodolancic/selenium,oddui/selenium,mojwang/selenium,titusfortner/selenium,DrMarcII/selenium,asolntsev/selenium,lmtierney/selenium,Dude-X/selenium,markodolancic/selenium,joshmgrant/selenium,asolntsev/selenium,davehunt/selenium,joshbruning/selenium,jsakamoto/selenium,dibagga/selenium,carlosroh/selenium,dibagga/selenium,jsakamoto/selenium,valfirst/selenium,Ardesco/selenium,Jarob22/selenium,davehunt/selenium,asolntsev/selenium,jabbrwcky/selenium,HtmlUnit/selenium,5hawnknight/selenium,carlosroh/selenium,Ardesco/selenium,Ardesco/selenium,markodolancic/selenium,krmahadevan/selenium,GorK-ChO/selenium,DrMarcII/selenium,DrMarcII/selenium,5hawnknight/selenium,juangj/selenium,twalpole/selenium,kalyanjvn1/selenium,jabbrwcky/selenium,SeleniumHQ/selenium,HtmlUnit/selenium,Tom-Trumper/selenium,twalpole/selenium,5hawnknight/selenium,juangj/selenium,gurayinan/selenium,joshmgrant/selenium,markodolancic/selenium,kalyanjvn1/selenium,davehunt/selenium,asashour/selenium,joshbruning/selenium,asolntsev/selenium,markodolancic/selenium,chrisblock/selenium,asolntsev/selenium,titusfortner/selenium,Tom-Trumper/selenium,jsakamoto/selenium,jsakamoto/selenium,SeleniumHQ/selenium,SeleniumHQ/selenium,mojwang/selenium,dibagga/selenium,titusfortner/selenium,bayandin/selenium,twalpole/selenium,Tom-Trumper/selenium,Jarob22/selenium,chrisblock/selenium,gurayinan/selenium,joshbruning/selenium,oddui/selenium,krmahadevan/selenium,tbeadle/selenium,davehunt/selenium,Jarob22/selenium,Tom-Trumper/selenium,asashour/selenium,gurayinan/selenium,Ardesco/selenium,oddui/selenium,Jarob22/selenium,5hawnknight/selenium,joshmgrant/selenium,kalyanjvn1/selenium,bayandin/selenium,oddui/selenium,GorK-ChO/selenium,SeleniumHQ/selenium,Tom-Trumper/selenium,gurayinan/selenium,xsyntrex/selenium,mach6/selenium,titusfortner/selenium,asashour/selenium,oddui/selenium,twalpole/selenium,GorK-ChO/selenium,juangj/selenium,mach6/selenium,lmtierney/selenium,HtmlUnit/selenium,tbeadle/selenium,mojwang/selenium,asolntsev/selenium,xsyntrex/selenium,Jarob22/selenium,twalpole/selenium,Ardesco/selenium,twalpole/selenium,davehunt/selenium,Ardesco/selenium,xsyntrex/selenium,twalpole/selenium,jsakamoto/selenium,chrisblock/selenium,titusfortner/selenium,bayandin/selenium,krmahadevan/selenium,DrMarcII/selenium,lmtierney/selenium,tbeadle/selenium,oddui/selenium,GorK-ChO/selenium,davehunt/selenium,valfirst/selenium,HtmlUnit/selenium,chrisblock/selenium,joshmgrant/selenium,GorK-ChO/selenium,valfirst/selenium,GorK-ChO/selenium,kalyanjvn1/selenium,joshbruning/selenium,mojwang/selenium,jabbrwcky/selenium,Jarob22/selenium,titusfortner/selenium,joshbruning/selenium,gurayinan/selenium,DrMarcII/selenium