Provide a convenience array buffer allocator

tools/parser-shell.cc

Index: tools/parser-shell.cc
diff --git a/tools/parser-shell.cc b/tools/parser-shell.cc
index 810c5b9d174c5d25497ed3c96edd1705fe67af99..f4e54402b12791c04081ac3ef30093beb149cbc4 100644
--- a/tools/parser-shell.cc
+++ b/tools/parser-shell.cc
@@ -45,16 +45,6 @@
 
 using namespace v8::internal;
 
-class ArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
- public:
-  virtual void* Allocate(size_t length) {
-    void* data = AllocateUninitialized(length);
-    return data == NULL ? data : memset(data, 0, length);
-  }
-  virtual void* AllocateUninitialized(size_t length) { return malloc(length); }
-  virtual void Free(void* data, size_t) { free(data); }
-};
-
 class StringResource8 : public v8::String::ExternalOneByteStringResource {
  public:
   StringResource8(const char* data, int length)
@@ -168,9 +158,9 @@ int main(int argc, char* argv[]) {
       fnames.push_back(std::string(argv[i]));
     }
   }
-  ArrayBufferAllocator array_buffer_allocator;
   v8::Isolate::CreateParams create_params;
-  create_params.array_buffer_allocator = &array_buffer_allocator;
+  create_params.array_buffer_allocator =
+      v8::ArrayBuffer::Allocator::NewDefaultAllocator();
   v8::Isolate* isolate = v8::Isolate::New(create_params);
   {
     v8::Isolate::Scope isolate_scope(isolate);
@@ -199,5 +189,6 @@ int main(int argc, char* argv[]) {
   v8::V8::Dispose();
   v8::V8::ShutdownPlatform();
   delete platform;
+  delete create_params.array_buffer_allocator;
   return 0;
 }