Clean up CodeObservers

runtime/vm/isolate.cc

Index: runtime/vm/isolate.cc
diff --git a/runtime/vm/isolate.cc b/runtime/vm/isolate.cc
index 061cf7cbc4a35844b1754e623a7709eb3e914dfc..788c4118caa9abbc94c33dd6d1e3c2baab9f4005 100644
--- a/runtime/vm/isolate.cc
+++ b/runtime/vm/isolate.cc
@@ -7,11 +7,11 @@
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "lib/mirrors.h"
+#include "vm/code_observers.h"
 #include "vm/compiler_stats.h"
 #include "vm/dart_api_state.h"
 #include "vm/dart_entry.h"
 #include "vm/debugger.h"
-#include "vm/debuginfo.h"
 #include "vm/heap.h"
 #include "vm/message_handler.h"
 #include "vm/object_store.h"
@@ -30,7 +30,6 @@ DEFINE_FLAG(bool, report_usage_count, false,
             "Track function usage and report.");
 DEFINE_FLAG(bool, trace_isolates, false,
             "Trace isolate creation and shut down.");
-DECLARE_FLAG(bool, generate_gdb_symbols);
 
 
 class IsolateMessageHandler : public MessageHandler {
@@ -543,9 +542,9 @@ void Isolate::Shutdown() {
     PrintInvokedFunctions();
   }
   CompilerStats::Print();
-  if (FLAG_generate_gdb_symbols) {
-    DebugInfo::UnregisterAllSections();
-  }
+  // TODO(asiva): Move this code to Dart::Cleanup when we have that method
+  // as the cleanup for Dart::InitOnce.
+  CodeObservers::DeleteAll();
   if (FLAG_trace_isolates) {
     StackZone zone(this);
     HandleScope handle_scope(this);