Replace DumpBacktrace with Chromium's StackTrace implementation.

src/base/free_deleter.h

+// Copyright 2016 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.
+
+// Slightly adapted for inclusion in V8.
+// Copyright 2016 the V8 project authors. All rights reserved.
+
+#ifndef V8_BASE_FREE_DELETER_H_
+#define V8_BASE_FREE_DELETER_H_
+
+#include <stdlib.h>
+
+namespace v8 {
+namespace base {
+
+// Function object which invokes 'free' on its parameter, which must be
+// a pointer. Can be used to store malloc-allocated pointers in std::unique_ptr:
+//
+// std::unique_ptr<int, base::FreeDeleter> foo_ptr(
+//     static_cast<int*>(malloc(sizeof(int))));
+struct FreeDeleter {
+  inline void operator()(void* ptr) const { free(ptr); }
+};
+
+}  // namespace base
+}  // namespace v8
+
+#endif  // V8_BASE_FREE_DELETER_H_