Remove unused code that was copied from actionpack
Remove unused code that was copied from actionpack

`abstract_unit.rb` in actionview was copied from actionpack in the
commit eb23754e. But some part is never used for actionview's tests.

kddeisz/rails,kddeisz/rails,travisofthenorth/rails,kirs/rails-1,lcreid/rails,rails/rails,deraru/rails,yahonda/rails,assain/rails,deraru/rails,illacceptanything/illacceptanything,kamipo/rails,felipecvo/rails,BlakeWilliams/rails,tgxworld/rails,baerjam/rails,illacceptanything/illacceptanything,georgeclaghorn/rails,EmmaB/rails-1,illacceptanything/illacceptanything,schuetzm/rails,Vasfed/rails,gauravtiwari/rails,MSP-Greg/rails,starknx/rails,esparta/rails,fabianoleittes/rails,shioyama/rails,lcreid/rails,gfvcastro/rails,printercu/rails,tjschuck/rails,utilum/rails,kirs/rails-1,assain/rails,illacceptanything/illacceptanything,felipecvo/rails,notapatch/rails,iainbeeston/rails,assain/rails,flanger001/rails,utilum/rails,iainbeeston/rails,Vasfed/rails,Stellenticket/rails,yahonda/rails,kmcphillips/rails,mechanicles/rails,brchristian/rails,rafaelfranca/omg-rails,tjschuck/rails,aditya-kapoor/rails,brchristian/rails,joonyou/rails,bogdanvlviv/rails,MSP-Greg/rails,assain/rails,shioyama/rails,kddeisz/rails,bogdanvlviv/rails,printercu/rails,yhirano55/rails,travisofthenorth/rails,utilum/rails,tgxworld/rails,flanger001/rails,repinel/rails,tgxworld/rails,prathamesh-sonpatki/rails,kmcphillips/rails,BlakeWilliams/rails,mechanicles/rails,esparta/rails,utilum/rails,tgxworld/rails,pvalena/rails,pvalena/rails,georgeclaghorn/rails,baerjam/rails,illacceptanything/illacceptanything,Erol/rails,schuetzm/rails,Edouard-chin/rails,gfvcastro/rails,mohitnatoo/rails,prathamesh-sonpatki/rails,vipulnsward/rails,yalab/rails,georgeclaghorn/rails,travisofthenorth/rails,bogdanvlviv/rails,lcreid/rails,kmcphillips/rails,yalab/rails,yawboakye/rails,yawboakye/rails,pvalena/rails,printercu/rails,aditya-kapoor/rails,mechanicles/rails,kmcphillips/rails,untidy-hair/rails,betesh/rails,felipecvo/rails,palkan/rails,joonyou/rails,yasslab/railsguides.jp,odedniv/rails,Envek/rails,pvalena/rails,gfvcastro/rails,Vasfed/rails,Stellenticket/rails,brchristian/rails,BlakeWilliams/rails,arunagw/rails,rafaelfranca/omg-rails,gauravtiwari/rails,notapatch/rails,baerjam/rails,shioyama/rails,fabianoleittes/rails,jeremy/rails,Erol/rails,notapatch/rails,yahonda/rails,EmmaB/rails-1,MSP-Greg/rails,kddeisz/rails,Envek/rails,rails/rails,eileencodes/rails,EmmaB/rails-1,gfvcastro/rails,mechanicles/rails,yawboakye/rails,vipulnsward/rails,illacceptanything/illacceptanything,MSP-Greg/rails,mohitnatoo/rails,betesh/rails,Edouard-chin/rails,Edouard-chin/rails,iainbeeston/rails,illacceptanything/illacceptanything,baerjam/rails,deraru/rails,shioyama/rails,yasslab/railsguides.jp,arunagw/rails,Stellenticket/rails,repinel/rails,yalab/rails,mohitnatoo/rails,eileencodes/rails,odedniv/rails,palkan/rails,betesh/rails,vipulnsward/rails,untidy-hair/rails,Vasfed/rails,starknx/rails,lcreid/rails,odedniv/rails,flanger001/rails,betesh/rails,BlakeWilliams/rails,vipulnsward/rails,illacceptanything/illacceptanything,mohitnatoo/rails,illacceptanything/illacceptanything,aditya-kapoor/rails,illacceptanything/illacceptanything,joonyou/rails,tjschuck/rails,fabianoleittes/rails,Envek/rails,flanger001/rails,georgeclaghorn/rails,notapatch/rails,jeremy/rails,kamipo/rails,rails/rails,untidy-hair/rails,yhirano55/rails,Erol/rails,yhirano55/rails,yasslab/railsguides.jp,illacceptanything/illacceptanything,kirs/rails-1,aditya-kapoor/rails,deraru/rails,arunagw/rails,esparta/rails,iainbeeston/rails,printercu/rails,Stellenticket/rails,gauravtiwari/rails,yahonda/rails,fabianoleittes/rails,yasslab/railsguides.jp,eileencodes/rails,yhirano55/rails,tjschuck/rails,Erol/rails,untidy-hair/rails,yawboakye/rails,rails/rails,rafaelfranca/omg-rails,repinel/rails,illacceptanything/illacceptanything,jeremy/rails,joonyou/rails,palkan/rails,illacceptanything/illacceptanything,Edouard-chin/rails,jeremy/rails,eileencodes/rails,repinel/rails,palkan/rails,esparta/rails,illacceptanything/illacceptanything,starknx/rails,schuetzm/rails,bogdanvlviv/rails,prathamesh-sonpatki/rails,Envek/rails,travisofthenorth/rails,prathamesh-sonpatki/rails,kamipo/rails,yalab/rails,schuetzm/rails,illacceptanything/illacceptanything,arunagw/rails