PHPUnit coverage comment must not have parentheses

PHPUnit coverage comment must not have parentheses

Those comments have the format:
 @covers Class::Method

In PHPUnit 3.5.12, the comment is split by :: and method_exist called on
the resulting string. When one use  Class::Method(), the result is a call
to method_exist( 'Method()' ) which is always false and raise an exception

Removing parentheses from r79118 solve the issue. This also kind of
revert r79164.