remove most uses of raw handle constructors

src/d8.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1058 matching lines @@
   for (int i = 0; i < size;) {
     int read = static_cast<int>(fread(&chars[i], 1, size - i, file));
     i += read;
   }
   fclose(file);
   *size_out = size;
   return chars;
 }
 
 static void ReadBufferWeakCallback(v8::Isolate* isolate,
-                                   Persistent<Value>* object,
+                                   Persistent<ArrayBuffer>* array_buffer,
                                    uint8_t* data) {
-  size_t byte_length = ArrayBuffer::Cast(**object)->ByteLength();
+  size_t byte_length =
+      Local<ArrayBuffer>::New(isolate, *array_buffer)->ByteLength();
   isolate->AdjustAmountOfExternalAllocatedMemory(
       -static_cast<intptr_t>(byte_length));
 
   delete[] data;
-  object->Dispose(isolate);
+  array_buffer->Dispose();
 }
 
 void Shell::ReadBuffer(const v8::FunctionCallbackInfo<v8::Value>& args) {
   ASSERT(sizeof(char) == sizeof(uint8_t));  // NOLINT
   String::Utf8Value filename(args[0]);
   int length;
   if (*filename == NULL) {
     Throw("Error loading file");
     return;
   }
 
   Isolate* isolate = args.GetIsolate();
   uint8_t* data = reinterpret_cast<uint8_t*>(
       ReadChars(args.GetIsolate(), *filename, &length));
   if (data == NULL) {
     Throw("Error reading file");
     return;
   }
   Handle<v8::ArrayBuffer> buffer = ArrayBuffer::New(data, length);
-  v8::Persistent<v8::Value> weak_handle(isolate, buffer);
+  v8::Persistent<v8::ArrayBuffer> weak_handle(isolate, buffer);
   weak_handle.MakeWeak(isolate, data, ReadBufferWeakCallback);
   weak_handle.MarkIndependent();
   isolate->AdjustAmountOfExternalAllocatedMemory(length);
 
   args.GetReturnValue().Set(buffer);
 }
 
 
 #ifndef V8_SHARED
 static char* ReadToken(char* data, char token) {
@@ skipping 539 matching lines @@
 }
 
 }  // namespace v8
 
 
 #ifndef GOOGLE3
 int main(int argc, char* argv[]) {
   return v8::Shell::Main(argc, argv);
 }
 #endif