Revert 428. Breaks 64-bit compilation.

src/api.h

 // Copyright 2008 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 94 matching lines @@
 
 void NeanderObject::set(int offset, v8::internal::Object* value) {
   ASSERT(value_->HasFastElements());
   v8::internal::FixedArray::cast(value_->elements())->set(offset, value);
 }
 
 
 template <typename T> static inline T ToCData(v8::internal::Object* obj) {
   STATIC_ASSERT(sizeof(T) == sizeof(v8::internal::Address));
   return reinterpret_cast<T>(
-      reinterpret_cast<intptr_t>(v8::internal::Proxy::cast(obj)->proxy()));
+      reinterpret_cast<int>(v8::internal::Proxy::cast(obj)->proxy()));
 }
 
 
 template <typename T>
 static inline v8::internal::Handle<v8::internal::Object> FromCData(T obj) {
   STATIC_ASSERT(sizeof(T) == sizeof(v8::internal::Address));
   return v8::internal::Factory::NewProxy(
-      reinterpret_cast<v8::internal::Address>(reinterpret_cast<intptr_t>(obj)));
+      reinterpret_cast<v8::internal::Address>(reinterpret_cast<int>(obj)));
 }
 
 
 v8::Arguments::Arguments(v8::Local<v8::Value> data,
                          v8::Local<v8::Object> holder,
                          v8::Local<v8::Function> callee,
                          bool is_construct_call,
                          void** values, int length)
     : data_(data), holder_(holder), callee_(callee),
       is_construct_call_(is_construct_call),
@@ skipping 367 matching lines @@
 #ifdef DEBUG
   ImplementationUtilities::ZapHandleRange(
       reinterpret_cast<void**>(spare),
       reinterpret_cast<void**>(&spare[kHandleBlockSize]));
 #endif
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_API_H_