Eta reduction of some lambdas.

Rx.NET/Source/src/System.Reactive/EventPatternSourceBase.cs

@@ -71,7 +71,7 @@ namespace System.Reactive
             var d = _source.Subscribe/*Unsafe*/(
                 x => _invokeHandler(invoke, /*this,*/ x),
                 ex => { remove(); ex.Throw(); },
-                () => remove()
+                remove
             );
 
             lock (gate)

Rx.NET/Source/src/System.Reactive/EventSource.cs

@@ -44,7 +44,7 @@ namespace System.Reactive
                 var d = _source.Subscribe/*Unsafe*/(
                     x => _invokeHandler(value, /*this,*/ x),
                     ex => { remove(); ex.Throw(); },
-                    () => remove()
+                    remove
                 );
 
                 lock (gate)