Fixed browser crash when using Debug build:

chrome/renderer/net_benchmarking_extension.cc

Index: chrome/renderer/net_benchmarking_extension.cc
diff --git a/chrome/renderer/net_benchmarking_extension.cc b/chrome/renderer/net_benchmarking_extension.cc
new file mode 100644
index 0000000000000000000000000000000000000000..333c9310cccb98f3e7f14b69b2ada9a135c53b3c
--- /dev/null
+++ b/chrome/renderer/net_benchmarking_extension.cc
@@ -0,0 +1,51 @@
+// Copyright (c) 2013 The Chromium 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 "chrome/renderer/net_benchmarking_extension.h"
+
+#include "chrome/common/benchmarking_messages.h"
+#include "content/public/renderer/render_thread.h"
+#include "v8/include/v8.h"
+
+const char kNetBenchmarkingExtensionName[] = "v8/NetBenchmarking";
+
+namespace extensions_v8 {
+
+class NetBenchmarkingWrapper : public v8::Extension {
+ public:
+  NetBenchmarkingWrapper() :
+      v8::Extension(kNetBenchmarkingExtensionName,
+        "if (typeof(chrome) == 'undefined') {"
+        "  chrome = {};"
+        "};"
+        "if (typeof(chrome.benchmarking) == 'undefined') {"
+        "  chrome.benchmarking = {};"
+        "};"
+        "chrome.benchmarking.closeConnections = function() {"
+        "  native function CloseConnections();"
+        "  CloseConnections();"
+        "};"
+        ) {}
+
+  virtual v8::Handle<v8::FunctionTemplate> GetNativeFunction(
+      v8::Handle<v8::String> name) {
+    if (name->Equals(v8::String::New("CloseConnections"))) {
+      return v8::FunctionTemplate::New(CloseConnections);
+    }
+
+    return v8::Handle<v8::FunctionTemplate>();
+  }
+
+  static v8::Handle<v8::Value> CloseConnections(const v8::Arguments& args) {
+    content::RenderThread::Get()->Send(
+        new ChromeViewHostMsg_CloseCurrentConnections());
+    return v8::Undefined();
+  }
+};
+
+v8::Extension* NetBenchmarkingExtension::Get() {
+  return new NetBenchmarkingWrapper();
+}
+
+}  // namespace extensions_v8