Fix memory leak in the debugger.

src/isolate.cc

 // Copyright 2012 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 <stdlib.h>
 
 #include "v8.h"
 
 #include "ast.h"
 #include "bootstrapper.h"
@@ skipping 1544 matching lines @@
 
 void Isolate::GlobalTearDown() {
   delete thread_data_table_;
 }
 
 
 void Isolate::Deinit() {
   if (state_ == INITIALIZED) {
     TRACE_ISOLATE(deinit);
 
+    debug()->Unload();
+
     if (concurrent_recompilation_enabled()) {
       optimizing_compiler_thread_->Stop();
       delete optimizing_compiler_thread_;
       optimizing_compiler_thread_ = NULL;
     }
 
     for (int i = 0; i < num_sweeper_threads_; i++) {
       sweeper_thread_[i]->Stop();
       delete sweeper_thread_[i];
       sweeper_thread_[i] = NULL;
@@ skipping 731 matching lines @@
       Execution::Call(this, microtask, factory()->undefined_value(),
                       0, NULL).Check();
     }
   }
 
   handle_scope_implementer()->DecrementCallDepth();
 }
 
 
 } }  // namespace v8::internal