Fix Observatory code coverage

runtime/bin/vmservice/client/lib/src/elements/script_view.dart

Index: runtime/bin/vmservice/client/lib/src/elements/script_view.dart
diff --git a/runtime/bin/vmservice/client/lib/src/elements/script_view.dart b/runtime/bin/vmservice/client/lib/src/elements/script_view.dart
index e3907ca799a868ae13b37b141eae271e5da5971f..64f8231cd9001c8c8d08b72f707b5053b3419e60 100644
--- a/runtime/bin/vmservice/client/lib/src/elements/script_view.dart
+++ b/runtime/bin/vmservice/client/lib/src/elements/script_view.dart
@@ -13,7 +13,6 @@ import 'package:polymer/polymer.dart';
 @CustomTag('script-view')
 class ScriptViewElement extends ObservatoryElement {
   @published Script script;
-  @published bool showCoverage = false;
 
   ScriptViewElement.created() : super.created();
 
@@ -26,20 +25,11 @@ class ScriptViewElement extends ObservatoryElement {
     script.load();
   }
 
-  showCoverageChanged(oldValue) {
-    ScriptInsetElement sie = shadowRoot.querySelector('#scriptInset');
-    sie.coverage = showCoverage;
-  }
-
   void refresh(var done) {
     script.reload().whenComplete(done);
   }
 
   void refreshCoverage(var done) {
-    script.isolate.refreshCoverage().then((_) {
-      ScriptInsetElement sie = shadowRoot.querySelector('#scriptInset');
-      showCoverage = true;
-      sie.coverage = showCoverage;
-    }).whenComplete(done);
+    script.isolate.refreshCoverage()..whenComplete(done);
   }
 }