Change the return value of setField to be in line with non-reflective assignments. Complete unwrapp…

runtime/lib/mirrors_impl.dart

Index: runtime/lib/mirrors_impl.dart
===================================================================
--- runtime/lib/mirrors_impl.dart	(revision 25390)
+++ runtime/lib/mirrors_impl.dart	(working copy)
@@ -194,9 +194,10 @@
   }
 
   InstanceMirror setField(Symbol memberName, Object value) {
-    return reflect(this._invokeSetter(_reflectee,
-                                      _n(memberName),
-                                      value)); 
+    this._invokeSetter(_reflectee,
+                       _n(memberName),
+                       value);
+    return reflect(value);
   }
 
   Future<InstanceMirror> invokeAsync(Symbol memberName,
@@ -239,10 +240,10 @@
               "a simple value or InstanceMirror";
       }
 
-      var result = this._invokeSetter(_reflectee,
-                                      _n(memberName),
-                                      unwrappedValue);
-      return new Future.value(reflect(result)); 
+      this._invokeSetter(_reflectee,
+                         _n(memberName),
+                         unwrappedValue);
+      return new Future.value(reflect(unwrappedValue)); 
     } catch(e) {
       return new Future.error(e);
     }