Silence Windows warning.

src/d8.cc

Index: src/d8.cc
diff --git a/src/d8.cc b/src/d8.cc
index 297bf79d09d5101bfd255d1b10483999e3644114..431782a3043512567107745e5717a1b342f5f59e 100644
--- a/src/d8.cc
+++ b/src/d8.cc
@@ -443,8 +443,9 @@ Handle<Value> Shell::CreateExternalArray(const Arguments& args,
 
 void Shell::ExternalArrayWeakCallback(Persistent<Value> object, void* data) {
   HandleScope scope;
-  Local<Value> length = object->ToObject()->Get(String::New("byteLength"));
-  V8::AdjustAmountOfExternalAllocatedMemory(-length->Uint32Value());
+  int32_t length =
+      object->ToObject()->Get(String::New("byteLength"))->Uint32Value();

[Michael Starzinger, 2012/06/01 12:00:10]

Hmm, this looks strange, it implicitly casts uint32 to int32. Are you sure
that's correct?

[rossberg, 2012/06/01 12:06:20]

It's done in other places, too. It's correct because we check that an array
buffer never exceeds 2G.

+  V8::AdjustAmountOfExternalAllocatedMemory(-length);
   delete[] static_cast<uint8_t*>(data);
   object.Dispose();
 }