Cutover v8 to use new style callbacks internally

src/extensions/gc-extension.cc

Index: src/extensions/gc-extension.cc
diff --git a/src/extensions/gc-extension.cc b/src/extensions/gc-extension.cc
index 1a2fe8ff4b3ff89a662d183c3cfcda9be8a149b7..036b60cb23151d887f851e2283e62570f5363cae 100644
--- a/src/extensions/gc-extension.cc
+++ b/src/extensions/gc-extension.cc
@@ -38,13 +38,12 @@ v8::Handle<v8::FunctionTemplate> GCExtension::GetNativeFunction(
 }
 
 
-v8::Handle<v8::Value> GCExtension::GC(const v8::Arguments& args) {
+void GCExtension::GC(const v8::FunctionCallbackInfo<v8::Value>& args) {
   if (args[0]->BooleanValue()) {
     HEAP->CollectGarbage(NEW_SPACE, "gc extension");
   } else {
     HEAP->CollectAllGarbage(Heap::kNoGCFlags, "gc extension");
   }
-  return v8::Undefined();
 }