Do not JSON encode the 'result' of a service rpc.

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

Index: runtime/observatory/lib/src/app/location_manager.dart
diff --git a/runtime/observatory/lib/src/app/location_manager.dart b/runtime/observatory/lib/src/app/location_manager.dart
index 13f9091c228dfaed5eb205f20ffd3761d68f3d8b..ec795e758f051fb0d771fdba1e5d2c0e81d966ba 100644
--- a/runtime/observatory/lib/src/app/location_manager.dart
+++ b/runtime/observatory/lib/src/app/location_manager.dart
@@ -125,7 +125,9 @@ class LocationManager extends Observable {
       return;
     }
     event.preventDefault();
-    var target = event.target;
+    // 'currentTarget' is the dom element that would process the event.
+    // If we use 'target' we might get an <em> element or somesuch.
+    var target = event.currentTarget;
     go(target.attributes['href']);
   }
 }