Mojo C++ bindings: switch WebKit mojom targets to use STL/WTF types.

third_party/WebKit/Source/modules/broadcastchannel/BroadcastChannel.cpp

 // Copyright 2016 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 "modules/broadcastchannel/BroadcastChannel.h"
 
 #include "bindings/core/v8/SerializedScriptValue.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/events/EventQueue.h"
 #include "core/events/MessageEvent.h"
@@ skipping 86 matching lines @@
 
 void BroadcastChannel::contextDestroyed() {
   close();
 }
 
 DEFINE_TRACE(BroadcastChannel) {
   ContextLifecycleObserver::trace(visitor);
   EventTargetWithInlineData::trace(visitor);
 }
 
-void BroadcastChannel::OnMessage(mojo::WTFArray<uint8_t> message) {
+void BroadcastChannel::OnMessage(const WTF::Vector<uint8_t>& message) {
   // Queue a task to dispatch the event.
   RefPtr<SerializedScriptValue> value = SerializedScriptValue::create(
-      reinterpret_cast<const char*>(&message.front()), message.size());
+      message.isEmpty() ? nullptr
+                        : reinterpret_cast<const char*>(&message.first()),
+      message.size());
   MessageEvent* event = MessageEvent::create(
       nullptr, value.release(),
       getExecutionContext()->getSecurityOrigin()->toString());
   event->setTarget(this);
   bool success = getExecutionContext()->getEventQueue()->enqueueEvent(event);
   DCHECK(success);
   ALLOW_UNUSED_LOCAL(success);
 }
 
 void BroadcastChannel::onError() {
@@ skipping 29 matching lines @@
       &remoteCientRequest);
   m_remoteClient.Bind(std::move(remoteClientInfo));
   m_remoteClient.set_connection_error_handler(convertToBaseCallback(
       WTF::bind(&BroadcastChannel::onError, wrapWeakPersistent(this))));
 
   provider->ConnectToChannel(m_origin, m_name, std::move(localClientInfo),
                              std::move(remoteCientRequest));
 }
 
 }  // namespace blink