Small refactor of pages

runtime/observatory/lib/src/app/application.dart

Index: runtime/observatory/lib/src/app/application.dart
diff --git a/runtime/observatory/lib/src/app/application.dart b/runtime/observatory/lib/src/app/application.dart
index 0c6f670ed3f89a067354ceae914b4dcc99498916..cee60ba074e90c6ecd8b375079c35fda2aebae26 100644
--- a/runtime/observatory/lib/src/app/application.dart
+++ b/runtime/observatory/lib/src/app/application.dart
@@ -195,13 +195,6 @@ class ObservatoryApplication extends Observable {
     currentPage = page;
   }
 
-  ObservatoryApplication.devtools(this.rootElement) :
-      locationManager = new HashLocationManager(),
-      targets = null {
-    vm = new PostMessageVM();
-    _initOnce(true);
-  }
-
   ObservatoryApplication(this.rootElement) :
       locationManager = new HashLocationManager(),
       targets = new TargetManager() {