Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/modules/mediarecorder/MediaRecorder.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 "modules/mediarecorder/MediaRecorder.h"
 
 #include "bindings/core/v8/Dictionary.h"
 #include "core/events/Event.h"
 #include "core/fileapi/Blob.h"
 #include "core/inspector/ConsoleMessage.h"
@@ skipping 314 matching lines @@
 {
     ASSERT(m_state != State::Inactive);
     m_state = State::Inactive;
 
     m_recorderHandler->stop();
 
     writeData(nullptr /* data */, 0 /* length */, true /* lastInSlice */);
     scheduleDispatchEvent(Event::create(EventTypeNames::stop));
 }
 
-void MediaRecorder::scheduleDispatchEvent(PassRefPtrWillBeRawPtr<Event> event)
+void MediaRecorder::scheduleDispatchEvent(RawPtr<Event> event)
 {
     m_scheduledEvents.append(event);
 
     m_dispatchScheduledEventRunner->runAsync();
 }
 
 void MediaRecorder::dispatchScheduledEvent()
 {
-    WillBeHeapVector<RefPtrWillBeMember<Event>> events;
+    HeapVector<Member<Event>> events;
     events.swap(m_scheduledEvents);
 
     for (const auto& event : events)
         dispatchEvent(event);
 }
 
 DEFINE_TRACE(MediaRecorder)
 {
     visitor->trace(m_stream);
     visitor->trace(m_dispatchScheduledEventRunner);
     visitor->trace(m_scheduledEvents);
     RefCountedGarbageCollectedEventTargetWithInlineData<MediaRecorder>::trace(visitor);
     ActiveDOMObject::trace(visitor);
 }
 
 } // namespace blink