Revert "Ensure the block called to Factory#run is actually called"

This reverts commit 4ede9f1.

spec/factory_girl/factory_spec.rb

@@ -272,12 +272,4 @@
     subject.run(FactoryGirl::Proxy::Build, { :name => "John Doe" })
     proxy.should have_received(:set).once
   end
-
-  it "calls the block and returns the result" do
-    block = proc { nil }
-    block.stubs(:call => "block result")
-
-    subject.run(FactoryGirl::Proxy::Build, { }, &block).should == "block result"
-    block.should have_received(:call).once
-  end
 end