Drop Paths::Root initializer check of #path as it isn't checked in the #path= or anywhere else

railties/lib/rails/paths.rb

@@ -45,7 +45,6 @@ class Root
       attr_accessor :path
 
       def initialize(path)
-        raise "Argument should be a String of the physical root path" if path.is_a?(Array)
         @current = nil
         @path = path
         @root = {}

railties/test/paths_test.rb

@@ -91,10 +91,6 @@ def setup
     assert_equal ["/foo/bar/app2", "/foo/bar/app"], @root["app"].to_a
   end
 
-  test "the root can only have one physical path" do
-    assert_raise(RuntimeError) { Rails::Paths::Root.new(["/fiz", "/biz"]) }
-  end
-
   test "it is possible to add a path that should be autoloaded only once" do
     @root.add "app", :with => "/app"
     @root["app"].autoload_once!