Fix many warnings/errors when building Observatory

runtime/observatory/lib/src/elements/isolate_view.dart

Index: runtime/observatory/lib/src/elements/isolate_view.dart
diff --git a/runtime/observatory/lib/src/elements/isolate_view.dart b/runtime/observatory/lib/src/elements/isolate_view.dart
index c82a305edd332677e20361d23ac7add2ec760bc3..f09f0422d9a8d8de5950d5088a4d081ab040469e 100644
--- a/runtime/observatory/lib/src/elements/isolate_view.dart
+++ b/runtime/observatory/lib/src/elements/isolate_view.dart
@@ -134,7 +134,7 @@ class IsolateViewElement extends HtmlElement implements Renderable {
   void render() {
     final uptime = new DateTime.now().difference(_isolate.startTime);
     final libraries = _isolate.libraries.toList();
-    final List<Thread> threads = _isolate.threads;
+    final List<M.Thread> threads = _isolate.threads;
     children = [
       navBar([
         new NavTopMenuElement(queue: _r.queue),
@@ -362,7 +362,7 @@ class IsolateViewElement extends HtmlElement implements Renderable {
     ];
   }
 
-  DivElement _populateThreadInfo(Thread t) {
+  DivElement _populateThreadInfo(M.Thread t) {
     int index = 0;
     return new DivElement()
       ..classes = ['indent']