Test that setRequestHeader properly checks for line feeds in header values.

%0AEvil%3A%20on -> SUCCESS, setRequestHeader() raised an exception Error: SyntaxError: DOM Exception 12

%0DEvil%3A%20on -> SUCCESS, setRequestHeader() raised an exception Error: SyntaxError: DOM Exception 12

%0D%0AEvil%3A%20on -> SUCCESS, setRequestHeader() raised an exception Error: SyntaxError: DOM Exception 12

%0A%0DEvil%3A%20on -> SUCCESS, setRequestHeader() raised an exception Error: SyntaxError: DOM Exception 12