[Isolates] Fix memory leaks in Isolate and Logger.

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index ce2ff4d720310e952451e309645a1a585e2b2aa8..49b005ab388c292515aa37f8a18b90c4137c63a2 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -499,6 +499,11 @@ Isolate::~Isolate() {
   delete cpu_features_;
   cpu_features_ = NULL;
 
+  delete handle_scope_implementer_;
+  handle_scope_implementer_ = NULL;
+  delete break_access_;
+  break_access_ = NULL;
+
   delete compilation_cache_;
   compilation_cache_ = NULL;
   delete bootstrapper_;
@@ -585,11 +590,6 @@ bool Isolate::PreInit() {
   regexp_stack_ = new RegExpStack();
   regexp_stack_->isolate_ = this;
 
-#ifdef ENABLE_DEBUGGER_SUPPORT
-  debugger_ = new Debugger();
-  debugger_->isolate_ = this;
-#endif
-
 #ifdef ENABLE_LOGGING_AND_PROFILING
   producer_heap_profile_ = new ProducerHeapProfile();
   producer_heap_profile_->isolate_ = this;