ci: install chrome on appveyor
ci: install chrome on appveyor

Followup to https://github.com/angular/angular-cli/pull/9747.

Now webdriver needs Chrome 64.

nickroberts/angular-cli,Brocco/angular-cli,maxime1992/angular-cli,angular/angular-cli,DevIntent/angular-cli,hansl/angular-cli,ocombe/angular-cli,Brocco/angular-cli,ocombe/angular-cli,clydin/angular-cli,filipesilva/angular-cli,Brocco/angular-cli,filipesilva/angular-cli,clydin/angular-cli,ocombe/angular-cli,geofffilippi/angular-cli,manekinekko/angular-cli,catull/angular-cli,beeman/angular-cli,ocombe/angular-cli,filipesilva/angular-cli,geofffilippi/angular-cli,DevIntent/angular-cli,angular/angular-cli,angular/angular-cli,beeman/angular-cli,maxime1992/angular-cli,DevIntent/angular-cli,clydin/angular-cli,filipesilva/angular-cli,geofffilippi/angular-cli,Brocco/angular-cli,ocombe/angular-cli,manekinekko/angular-cli,manekinekko/angular-cli,hansl/angular-cli,catull/angular-cli,clydin/angular-cli,DevIntent/angular-cli,hansl/angular-cli,beeman/angular-cli,angular/angular-cli,catull/angular-cli,Brocco/angular-cli,nickroberts/angular-cli,nickroberts/angular-cli,maxime1992/angular-cli,beeman/angular-cli,hansl/angular-cli,DevIntent/angular-cli,geofffilippi/angular-cli,catull/angular-cli