Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/modules/fetch/FetchManager.cpp

 // Copyright 2014 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/fetch/FetchManager.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "bindings/core/v8/V8ThrowException.h"
@@ skipping 157 matching lines @@
     Member<FetchManager> m_fetchManager;
     Member<ScriptPromiseResolver> m_resolver;
     Member<FetchRequestData> m_request;
     OwnPtr<ThreadableLoader> m_loader;
     bool m_failed;
     bool m_finished;
     int m_responseHttpStatusCode;
     Member<SRIVerifier> m_integrityVerifier;
     bool m_didFinishLoading;
     bool m_isIsolatedWorld;
-    RawPtrWillBeMember<ExecutionContext> m_executionContext;
+    Member<ExecutionContext> m_executionContext;
 };
 
 FetchManager::Loader::Loader(ExecutionContext* executionContext, FetchManager* fetchManager, ScriptPromiseResolver* resolver, FetchRequestData* request, bool isIsolatedWorld)
     : m_fetchManager(fetchManager)
     , m_resolver(resolver)
     , m_request(request)
     , m_failed(false)
     , m_finished(false)
     , m_responseHttpStatusCode(0)
     , m_integrityVerifier(nullptr)
@@ skipping 559 matching lines @@
     loader->dispose();
 }
 
 DEFINE_TRACE(FetchManager)
 {
     visitor->trace(m_loaders);
     ContextLifecycleObserver::trace(visitor);
 }
 
 } // namespace blink