NewError no longer returns a MaybeObject.

src/api.cc

 // Copyright 2012 the V8 project 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 "src/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 6936 matching lines @@
 #define DEFINE_ERROR(NAME)                                                    \
   Local<Value> Exception::NAME(v8::Handle<v8::String> raw_message) {          \
     i::Isolate* isolate = i::Isolate::Current();                              \
     LOG_API(isolate, #NAME);                                                  \
     ON_BAILOUT(isolate, "v8::Exception::" #NAME "()", return Local<Value>()); \
     ENTER_V8(isolate);                                                        \
     i::Object* error;                                                         \
     {                                                                         \
       i::HandleScope scope(isolate);                                          \
       i::Handle<i::String> message = Utils::OpenHandle(*raw_message);         \
-      i::Handle<i::Object> result;                                            \
-      EXCEPTION_PREAMBLE(isolate);                                            \
-      i::MaybeHandle<i::Object> maybe_result =                                \
-          isolate->factory()->New##NAME(message);                             \
-      has_pending_exception = !maybe_result.ToHandle(&result);                \
-      /* TODO(yangguo): crbug/403509. Return empty handle instead. */         \
-      EXCEPTION_BAILOUT_CHECK(                                                \
-          isolate, v8::Undefined(reinterpret_cast<v8::Isolate*>(isolate)));   \
-      error = *result;                                                        \
+      error = *isolate->factory()->New##NAME(message);                        \
     }                                                                         \
     i::Handle<i::Object> result(error, isolate);                              \
     return Utils::ToLocal(result);                                            \
   }
 
 DEFINE_ERROR(RangeError)
 DEFINE_ERROR(ReferenceError)
 DEFINE_ERROR(SyntaxError)
 DEFINE_ERROR(TypeError)
 DEFINE_ERROR(Error)
@@ skipping 807 matching lines @@
   Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 } }  // namespace v8::internal