No need to use fully-qualified name now that it has been renamed from ProtocolHandler (that clashed with an internal Tomcat class)

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1491948 13f79535-47bb-0310-9956-ffa450edef68
Servlet 3.1 section 2.3.3.5 states that the application prepares the response (which may include setting headers) after the call to upgrade()

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1491962 13f79535-47bb-0310-9956-ffa450edef68
Fix test broken by r1491940

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1491967 13f79535-47bb-0310-9956-ffa450edef68
Servlet 3.1 expands the list of reserved names.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1491976 13f79535-47bb-0310-9956-ffa450edef68