Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/modules/fetch/CrossThreadHolder.h

 // 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.
 
 #ifndef CrossThreadHolder_h
 #define CrossThreadHolder_h
 
 #include "core/dom/ActiveDOMObject.h"
 #include "core/dom/CrossThreadTask.h"
 #include "core/dom/ExecutionContext.h"
@@ skipping 73 matching lines @@
     private:
         MutexWrapper() = default;
         Mutex m_mutex;
     };
 
     // All methods except for clearInternal()
     // must be called on |executionContext|'s thread.
     class Bridge
         : public GarbageCollectedFinalized<Bridge>
         , public ActiveDOMObject {
-        WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(Bridge);
+        USING_GARBAGE_COLLECTED_MIXIN(Bridge);
     public:
         Bridge(ExecutionContext* executionContext, PassOwnPtr<T> obj, PassRefPtr<MutexWrapper> mutex, CrossThreadHolder* holder)
             : ActiveDOMObject(executionContext)
             , m_obj(obj)
             , m_mutex(mutex)
             , m_holder(holder)
         {
             suspendIfNeeded();
         }
 
@@ skipping 63 matching lines @@
     RefPtr<MutexWrapper> m_mutex;
     // |m_bridge| is protected by |m_mutex|.
     // |m_bridge| is cleared before the thread that allocated |*m_bridge|
     // is stopped.
     CrossThreadPersistent<Bridge> m_bridge;
 };
 
 } // namespace blink
 
 #endif // CrossThreadHolder_h