Add a utility class to call stream methods implemented with v8 extras.

third_party/WebKit/Source/bindings/core/v8/V8BindingMacros.h

Index: third_party/WebKit/Source/bindings/core/v8/V8BindingMacros.h
diff --git a/third_party/WebKit/Source/bindings/core/v8/V8BindingMacros.h b/third_party/WebKit/Source/bindings/core/v8/V8BindingMacros.h
index 9d68f90a667aa068d8a37935949567b05071ec0a..3b55b06f35914fa096a57ab701b88beba9dff105 100644
--- a/third_party/WebKit/Source/bindings/core/v8/V8BindingMacros.h
+++ b/third_party/WebKit/Source/bindings/core/v8/V8BindingMacros.h
@@ -78,6 +78,12 @@ inline bool v8Call(v8::Maybe<T> maybe, T& outVariable, v8::TryCatch& tryCatch)
 }
 
 template <typename T>
+inline bool v8Call(v8::MaybeLocal<T> maybeLocal, v8::Local<T>& outVariable)
+{
+    return maybeLocal.ToLocal(&outVariable);
+}
+
+template <typename T>
 inline bool v8Call(v8::MaybeLocal<T> maybeLocal, v8::Local<T>& outVariable, v8::TryCatch& tryCatch)
 {
     bool success = maybeLocal.ToLocal(&outVariable);