Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/bindings/core/v8/V8MutationCallback.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 30 matching lines @@
     , m_scriptState(scriptState)
 {
     V8HiddenValue::setHiddenValue(scriptState, owner, V8HiddenValue::callback(scriptState->isolate()), callback);
     m_callback.setWeak(this, &setWeakCallback);
 }
 
 V8MutationCallback::~V8MutationCallback()
 {
 }
 
-void V8MutationCallback::call(const WillBeHeapVector<RefPtrWillBeMember<MutationRecord>>& mutations, MutationObserver* observer)
+void V8MutationCallback::call(const HeapVector<Member<MutationRecord>>& mutations, MutationObserver* observer)
 {
     if (!canInvokeCallback())
         return;
 
     v8::Isolate* isolate = m_scriptState->isolate();
 
     if (!m_scriptState->contextIsValid())
         return;
     ScriptState::Scope scope(m_scriptState.get());
 
@@ skipping 25 matching lines @@
     data.GetParameter()->m_callback.clear();
 }
 
 DEFINE_TRACE(V8MutationCallback)
 {
     MutationCallback::trace(visitor);
     ActiveDOMCallback::trace(visitor);
 }
 
 } // namespace blink