Enumerate the return value of dispatchEvent so it is clear.

third_party/WebKit/Source/bindings/core/v8/RejectedPromises.cpp

 // 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 "bindings/core/v8/RejectedPromises.h"
 
 #include "bindings/core/v8/ScopedPersistent.h"
 #include "bindings/core/v8/ScriptCallStack.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "bindings/core/v8/ScriptValue.h"
@@ skipping 52 matching lines @@
             return;
         ASSERT(!hasHandler());
 
         EventTarget* target = executionContext->errorEventTarget();
         if (RuntimeEnabledFeatures::promiseRejectionEventEnabled() && target && !executionContext->shouldSanitizeScriptError(m_resourceName, m_corsStatus)) {
             PromiseRejectionEventInit init;
             init.setPromise(ScriptPromise(m_scriptState, value));
             init.setReason(ScriptValue(m_scriptState, reason));
             init.setCancelable(true);
             RefPtrWillBeRawPtr<PromiseRejectionEvent> event = PromiseRejectionEvent::create(m_scriptState, EventTypeNames::unhandledrejection, init);
-            // Log to console if event was not preventDefault()'ed.
-            m_shouldLogToConsole = target->dispatchEvent(event);
+            // Log to console if event was not canceled.
+            m_shouldLogToConsole = target->dispatchEvent(event) == DispatchEventResult::NotCanceled;
         }
 
         if (m_shouldLogToConsole) {
             const String errorMessage = "Uncaught (in promise)";
             Vector<ScriptValue> args;
             args.append(ScriptValue(m_scriptState, v8String(m_scriptState->isolate(), errorMessage)));
             args.append(ScriptValue(m_scriptState, reason));
             RefPtrWillBeRawPtr<ScriptArguments> arguments = ScriptArguments::create(m_scriptState, args);
 
             String embedderErrorMessage = m_errorMessage;
@@ skipping 191 matching lines @@
         }
     }
 }
 
 void RejectedPromises::revokeNow(PassOwnPtr<Message> message)
 {
     message->revoke();
 }
 
 } // namespace blink