Add Observatory to sky dart_controller

mojo/dart/embedder/dart_debugger.cc

Index: mojo/dart/embedder/dart_debugger.cc
diff --git a/mojo/dart/embedder/dart_debugger.cc b/mojo/dart/embedder/dart_debugger.cc
index 31e9ee4b5fb9a6534eccf618e5a56dd98842cd8c..8c9398ac2aa0996c15c0e1419736c62b0605b9e9 100644
--- a/mojo/dart/embedder/dart_debugger.cc
+++ b/mojo/dart/embedder/dart_debugger.cc
@@ -7,7 +7,7 @@
 #include "dart/runtime/include/dart_api.h"
 #include "dart/runtime/include/dart_debugger_api.h"
 #include "dart/runtime/include/dart_native_api.h"
-#include "mojo/dart/embedder/dart_debugger.h"
+#include "dart_debugger.h"
 
 namespace mojo {
 namespace dart {
@@ -132,6 +132,7 @@ void DartDebugger::RemoveIsolate(Dart_IsolateId id) {
     DartDebuggerIsolate* isolate = isolates_[i];
     if (id == isolate->id()) {
       isolates_.erase(isolates_.begin() + i);
+      delete isolate;
       return;
     }
   }