Fix all Observatory warnings/errors.

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

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library debugger_page_element;
 
 import 'dart:async';
 import 'dart:html';
 import 'observatory_element.dart';
 import 'package:observatory/app.dart';
@@ skipping 771 matching lines @@
   String helpLong =
       'Refresh code coverage information for current frames.\n'
       '\n'
       'Syntax: refresh coverage\n\n';
 }
 
 class RefreshStackCommand extends DebuggerCommand {
   RefreshStackCommand(Debugger debugger) : super(debugger, 'stack', []);
 
   Future run(List<String> args) {
-    Set<Script> scripts = debugger.stackElement.activeScripts();
-    List pending = [];
     return debugger.refreshStack();
   }
 
   String helpShort = 'Refresh isolate stack';
 
   String helpLong =
       'Refresh isolate stack.\n'
       '\n'
       'Syntax: refresh stack\n';
 }
@@ skipping 218 matching lines @@
             'Breakpoint ${bpId} ${verb} at ${script.name}:${line}:${col}');
       } else {
         console.print(
             'Future breakpoint ${bpId} ${verb} at ${script.name}:${line}:${col}');
       }
     });
   }
 
   void _onEvent(ServiceEvent event) {
     switch(event.eventType) {
-      case ServiceEvent.kIsolateStart: {
-        var iso = event.owner;
-        console.print(
-            "Isolate ${iso.number} '${iso.name}' has been created");
-        break;
-      }
-
-      case ServiceEvent.kIsolateExit: {
-        var iso = event.owner;
-        if (iso == isolate) {
-          console.print("The current isolate has exited");
-        } else {
+      case ServiceEvent.kIsolateStart:
+        {
+          var iso = event.owner;
           console.print(
-              "Isolate ${iso.number} '${iso.name}' has exited");
+              "Isolate ${iso.number} '${iso.name}' has been created");
         }
         break;
-      }
+
+      case ServiceEvent.kIsolateExit:
+        {
+          var iso = event.owner;
+          if (iso == isolate) {
+            console.print("The current isolate has exited");
+          } else {
+            console.print(
+                "Isolate ${iso.number} '${iso.name}' has exited");
+          }
+        }
+        break;
 
       case ServiceEvent.kIsolateUpdate:
         var iso = event.owner;
         console.print("Isolate ${iso.number} renamed to '${iso.name}'");
         break;
 
       case ServiceEvent.kPauseStart:
       case ServiceEvent.kPauseExit:
       case ServiceEvent.kPauseBreakpoint:
       case ServiceEvent.kPauseInterrupted:
@@ skipping 110 matching lines @@
   }
 
   @override
   void attached() {
     super.attached();
 
     var navbarDiv = $['navbarDiv'];
     var stackDiv = $['stackDiv'];
     var splitterDiv = $['splitterDiv'];
     var cmdDiv = $['commandDiv'];
-    var consoleDiv = $['consoleDiv'];
 
     int navbarHeight = navbarDiv.clientHeight;
     int splitterHeight = splitterDiv.clientHeight;
     int cmdHeight = cmdDiv.clientHeight;
 
     int windowHeight = window.innerHeight;
     int fixedHeight = navbarHeight + splitterHeight + cmdHeight;
     int available = windowHeight - fixedHeight;
     int stackHeight = available ~/ 1.6;
     stackDiv.style.setProperty('height', '${stackHeight}px');
@@ skipping 305 matching lines @@
           default:
             busy = false;
             break;
         }
       });
   }
 
   DebuggerInputElement.created() : super.created();
 }