Avoid explicitly calling class methods when in class scope

lib/eventmachine.rb

@@ -986,7 +986,7 @@ def self.run_deferred_callbacks
         # do some work during the next_tick. The only mechanism we have from the
         # ruby side is next_tick itself, although ideally, we'd just drop a byte
         # on the loopback descriptor.
-        EM.next_tick {} if exception_raised
+        next_tick {} if exception_raised
       end
     end
   end
@@ -1081,7 +1081,7 @@ def self.spawn_threadpool
             raise error unless eback
             @resultqueue << [error, eback]
           end
-          EventMachine.signal_loopbreak
+          signal_loopbreak
         end
       end
       @threadpool << thread
@@ -1515,7 +1515,7 @@ def self.event_callback conn_binding, opcode, data
       else
         if $! # Bubble user generated errors.
           @wrapped_exception = $!
-          EM.stop
+          stop
         else
           raise ConnectionNotBound, "received ConnectionUnbound for an unknown signature: #{conn_binding}"
         end