Fix and re-enable test-api/InitializeAndDispose.

src/bootstrapper.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/bootstrapper.h"
 
 #include "src/accessors.h"
 #include "src/code-stubs.h"
 #include "src/extensions/externalize-string-extension.h"
 #include "src/extensions/free-buffer-extension.h"
@@ skipping 81 matching lines @@
   v8::RegisterExtension(externalize_string_extension_);
   statistics_extension_ = new StatisticsExtension;
   v8::RegisterExtension(statistics_extension_);
   trigger_failure_extension_ = new TriggerFailureExtension;
   v8::RegisterExtension(trigger_failure_extension_);
 }
 
 
 void Bootstrapper::TearDownExtensions() {
   delete free_buffer_extension_;
+  free_buffer_extension_ = NULL;
   delete gc_extension_;
+  gc_extension_ = NULL;
   delete externalize_string_extension_;
+  externalize_string_extension_ = NULL;
   delete statistics_extension_;
+  statistics_extension_ = NULL;
   delete trigger_failure_extension_;
+  trigger_failure_extension_ = NULL;
 }
 
 
 char* Bootstrapper::AllocateAutoDeletedArray(int bytes) {
   char* memory = new char[bytes];
   if (memory != NULL) {
     if (delete_these_arrays_on_tear_down_ == NULL) {
       delete_these_arrays_on_tear_down_ = new List<char*>(2);
     }
     delete_these_arrays_on_tear_down_->Add(memory);
@@ skipping 2606 matching lines @@
   return from + sizeof(NestingCounterType);
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   DCHECK(!IsActive());
 }
 
 } }  // namespace v8::internal