[js] Allow disabling the promise manager through a property setter.
[js] Allow disabling the promise manager through a property setter.

Using the property setter will always take precedence over the environment
variable.

#2969

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