Throw exception for null listener in addEventListener

sky/engine/tonic/dart_wrappable.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "sky/engine/config.h"
 #include "sky/engine/tonic/dart_wrappable.h"
 
 #include "sky/engine/tonic/dart_class_library.h"
 #include "sky/engine/tonic/dart_error.h"
 #include "sky/engine/tonic/dart_exception_factory.h"
 #include "sky/engine/tonic/dart_state.h"
 #include "sky/engine/tonic/dart_wrapper_info.h"
-#include "sky/engine/wtf/text/StringBuilder.h"
 
 namespace blink {
 
 DartWrappable::~DartWrappable() {
   CHECK(!dart_wrapper_);
 }
 
 void DartWrappable::AcceptDartGCVisitor(DartGCVisitor& visitor) const {
 }
 
@@ skipping 48 matching lines @@
   }
   return reinterpret_cast<DartWrappable*>(
       native_fields[DartWrappable::kPeerIndex]);
 }
 
 DartWrappable* DartConverterWrappable::FromArgumentsWithNullCheck(
     Dart_NativeArguments args, int index, Dart_Handle& exception) {
   Dart_Handle handle = Dart_GetNativeArgument(args, index);
   if (Dart_IsNull(handle)) {
     DartState* state = DartState::Current();
-    StringBuilder message;
-    message.appendLiteral("Argument ");
-    message.appendNumber(index);
-    message.appendLiteral(" cannot be null.");
-    exception = state->exception_factory().CreateException("ArgumentError",
-                                                           message.toString());
+    exception = state->exception_factory().CreateNullArgumentException(index);
     return nullptr;
   }
   intptr_t native_fields[DartWrappable::kNumberOfNativeFields];
   Dart_Handle result = Dart_GetNativeFieldsOfArgument(
       args, index, DartWrappable::kNumberOfNativeFields, native_fields);
   if (Dart_IsError(result)) {
     exception = Dart_NewStringFromCString(DartError::kInvalidArgument);
     return nullptr;
   }
   return reinterpret_cast<DartWrappable*>(
       native_fields[DartWrappable::kPeerIndex]);
 }
 
 }  // namespace blink