Improve comments and error message on scrolling_test#testScrollingAccountsForScrollbarWidths.
Improve comments and error message on scrolling_test#testScrollingAccountsForScrollbarWidths.

Partially reverts https://github.com/SeleniumHQ/selenium/commit/eda96a0fbba9cc5fdd14c43fb9eb36b04008a37f. That commit implies that the test was scrolling exactly 26px, which is incorrect behavior; lowering the threshold to 25px defeats the purpose of the test.

Signed-off-by: Luke Inman-Semerau <d043e0ec8842b544e9399c7553db97fe37240aa0@gmail.com>

valfirst/selenium,wambat/selenium,juangj/selenium,carlosroh/selenium,DrMarcII/selenium,Herst/selenium,arunsingh/selenium,Dude-X/selenium,rovner/selenium,meksh/selenium,sankha93/selenium,asolntsev/selenium,lukeis/selenium,lukeis/selenium,juangj/selenium,juangj/selenium,jerome-jacob/selenium,lilredindy/selenium,mestihudson/selenium,lukeis/selenium,alb-i986/selenium,lilredindy/selenium,gurayinan/selenium,joshuaduffy/selenium,tkurnosova/selenium,chrisblock/selenium,jerome-jacob/selenium,tkurnosova/selenium,doungni/selenium,rrussell39/selenium,5hawnknight/selenium,TikhomirovSergey/selenium,meksh/selenium,xmhubj/selenium,5hawnknight/selenium,gregerrag/selenium,sag-enorman/selenium,uchida/selenium,titusfortner/selenium,GorK-ChO/selenium,dibagga/selenium,SouWilliams/selenium,tbeadle/selenium,sankha93/selenium,5hawnknight/selenium,jsakamoto/selenium,HtmlUnit/selenium,bmannix/selenium,mojwang/selenium,joshmgrant/selenium,markodolancic/selenium,bartolkaruza/selenium,xmhubj/selenium,krmahadevan/selenium,titusfortner/selenium,chrisblock/selenium,valfirst/selenium,anshumanchatterji/selenium,xmhubj/selenium,lilredindy/selenium,rrussell39/selenium,BlackSmith/selenium,HtmlUnit/selenium,amar-sharma/selenium,lilredindy/selenium,meksh/selenium,TikhomirovSergey/selenium,anshumanchatterji/selenium,uchida/selenium,actmd/selenium,slongwang/selenium,valfirst/selenium,jerome-jacob/selenium,mach6/selenium,clavery/selenium,joshuaduffy/selenium,xsyntrex/selenium,minhthuanit/selenium,alexec/selenium,amikey/selenium,carlosroh/selenium,GorK-ChO/selenium,xsyntrex/selenium,kalyanjvn1/selenium,kalyanjvn1/selenium,stupidnetizen/selenium,chrisblock/selenium,5hawnknight/selenium,mach6/selenium,lmtierney/selenium,tbeadle/selenium,minhthuanit/selenium,s2oBCN/selenium,mach6/selenium,lmtierney/selenium,mestihudson/selenium,titusfortner/selenium,lrowe/selenium,asolntsev/selenium,asolntsev/selenium,p0deje/selenium,jerome-jacob/selenium,jabbrwcky/selenium,uchida/selenium,bartolkaruza/selenium,amikey/selenium,dibagga/selenium,SouWilliams/selenium,alb-i986/selenium,Herst/selenium,jsakamoto/selenium,lilredindy/selenium,mestihudson/selenium,joshbruning/selenium,gregerrag/selenium,uchida/selenium,gurayinan/selenium,mach6/selenium,Dude-X/selenium,amar-sharma/selenium,slongwang/selenium,dibagga/selenium,actmd/selenium,SouWilliams/selenium,HtmlUnit/selenium,bartolkaruza/selenium,oddui/selenium,rrussell39/selenium,lmtierney/selenium,juangj/selenium,lmtierney/selenium,xmhubj/selenium,stupidnetizen/selenium,Tom-Trumper/selenium,vveliev/selenium,meksh/selenium,tbeadle/selenium,bmannix/selenium,jerome-jacob/selenium,titusfortner/selenium,bmannix/selenium,sankha93/selenium,amikey/selenium,SouWilliams/selenium,sag-enorman/selenium,JosephCastro/selenium,quoideneuf/selenium,Ardesco/selenium,Jarob22/selenium,krmahadevan/selenium,asashour/selenium,joshuaduffy/selenium,o-schneider/selenium,minhthuanit/selenium,kalyanjvn1/selenium,lukeis/selenium,amikey/selenium,alexec/selenium,houchj/selenium,tbeadle/selenium,vveliev/selenium,slongwang/selenium,titusfortner/selenium,s2oBCN/selenium,mojwang/selenium,juangj/selenium,stupidnetizen/selenium,dcjohnson1989/selenium,twalpole/selenium,SouWilliams/selenium,mojwang/selenium,joshmgrant/selenium,quoideneuf/selenium,lmtierney/selenium,knorrium/selenium,carsonmcdonald/selenium,Tom-Trumper/selenium,rrussell39/selenium,rrussell39/selenium,s2oBCN/selenium,clavery/selenium,arunsingh/selenium,dcjohnson1989/selenium,bmannix/selenium,SouWilliams/selenium,joshbruning/selenium,sankha93/selenium,HtmlUnit/selenium,dcjohnson1989/selenium,TikhomirovSergey/selenium,asashour/selenium,DrMarcII/selenium,doungni/selenium,doungni/selenium,gregerrag/selenium,anshumanchatterji/selenium,krmahadevan/selenium,joshmgrant/selenium,actmd/selenium,alexec/selenium,valfirst/selenium,petruc/selenium,sankha93/selenium,carsonmcdonald/selenium,alexec/selenium,oddui/selenium,amar-sharma/selenium,p0deje/selenium,p0deje/selenium,vveliev/selenium,alb-i986/selenium,meksh/selenium,twalpole/selenium,meksh/selenium,p0deje/selenium,arunsingh/selenium,JosephCastro/selenium,petruc/selenium,carlosroh/selenium,s2oBCN/selenium,blackboarddd/selenium,JosephCastro/selenium,o-schneider/selenium,DrMarcII/selenium,bayandin/selenium,gregerrag/selenium,bayandin/selenium,clavery/selenium,o-schneider/selenium,slongwang/selenium,uchida/selenium,houchj/selenium,carsonmcdonald/selenium,tbeadle/selenium,lrowe/selenium,doungni/selenium,davehunt/selenium,Ardesco/selenium,wambat/selenium,lukeis/selenium,twalpole/selenium,chrisblock/selenium,carlosroh/selenium,DrMarcII/selenium,vveliev/selenium,DrMarcII/selenium,oddui/selenium,quoideneuf/selenium,HtmlUnit/selenium,rrussell39/selenium,dibagga/selenium,o-schneider/selenium,markodolancic/selenium,doungni/selenium,jsakamoto/selenium,SeleniumHQ/selenium,sankha93/selenium,gregerrag/selenium,o-schneider/selenium,SouWilliams/selenium,asashour/selenium,actmd/selenium,asolntsev/selenium,carsonmcdonald/selenium,Ardesco/selenium,davehunt/selenium,dibagga/seleni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