Remove usage of to-be-deprecated APIs from v8 core

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 fbe40a6195397be966c60dfadebd571649162377..f4026f57dcb477ac3033122d90ef1c719d71579f 100644
--- a/src/extensions/gc-extension.cc
+++ b/src/extensions/gc-extension.cc
@@ -19,8 +19,11 @@ v8::Handle<v8::FunctionTemplate> GCExtension::GetNativeFunctionTemplate(
 
 void GCExtension::GC(const v8::FunctionCallbackInfo<v8::Value>& args) {
   args.GetIsolate()->RequestGarbageCollectionForTesting(
-      args[0]->BooleanValue() ? v8::Isolate::kMinorGarbageCollection
-                              : v8::Isolate::kFullGarbageCollection);
+      args[0]
+              ->BooleanValue(args.GetIsolate()->GetCurrentContext())
+              .FromMaybe(false)
+          ? v8::Isolate::kMinorGarbageCollection
+          : v8::Isolate::kFullGarbageCollection);
 }
 
 }  // namespace internal