fix(urlUtils): urlUtils doesn't return right path for file:// on win

Chrome and other browsers on Windows often
append the drive name to the pathname,
as described in #4680. This would cause
the location service to browse to odd
URLs, such as /C:/myfile.html,
when opening apps using file://.

Fixes  #4680
Merge branch 'master' of https://github.com/angular/angular.js
componentizd!