Remove DebuggerEvent. Refactor remaining code.

runtime/vm/service.h

 // Copyright (c) 2013, 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.
 
 #ifndef VM_SERVICE_H_
 #define VM_SERVICE_H_
 
 #include "include/dart_tools_api.h"
 
 #include "vm/allocation.h"
@@ skipping 48 matching lines @@
  private:
   ObjectIdRing* ring_;
   ObjectIdRing::IdPolicy policy_;
 };
 
 
 class StreamInfo {
  public:
   explicit StreamInfo(const char* id) : id_(id), enabled_(false) {}
 
-  const char* id() { return id_; }
+  const char* id() const { return id_; }
 
   void set_enabled(bool value) { enabled_ = value; }
-  bool enabled() { return enabled_; }
+  bool enabled() const { return enabled_; }
 
  private:
   const char* id_;
   bool enabled_;
 };
 
 
 class Service : public AllStatic {
  public:
   // Handles a message which is not directed to an isolate.
@@ skipping 116 matching lines @@
   static bool needs_isolate_events_;
   static bool needs_debug_events_;
   static bool needs_gc_events_;
   static bool needs_echo_events_;
   static bool needs_graph_events_;
 };
 
 }  // namespace dart
 
 #endif  // VM_SERVICE_H_