Remove PreFinalizer{Callback} type aliases from view.

third_party/WebKit/Source/platform/heap/BlinkGC.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 BlinkGC_h
 #define BlinkGC_h
 
 // BlinkGC.h is a file that defines common things used by Blink GC.
 
 #include "platform/PlatformExport.h"
 #include "wtf/Allocator.h"
 
 namespace blink {
 
 class Visitor;
 
 #define PRINT_HEAP_STATS 0  // Enable this macro to print heap stats to stderr.
 
 using Address = uint8_t*;
 
 using FinalizationCallback = void (*)(void*);
 using VisitorCallback = void (*)(Visitor*, void* self);
 using TraceCallback = VisitorCallback;
 using WeakCallback = VisitorCallback;
 using EphemeronCallback = VisitorCallback;
-using PreFinalizerCallback = bool (*)(void*);
 
 // Simple alias to avoid heap compaction type signatures turning into
 // a sea of generic |void*|s.
 using MovableReference = void*;
 
 // Heap compaction supports registering callbacks that are to be invoked
 // when an object is moved during compaction. This is to support internal
 // location fixups that need to happen as a result.
 //
 // i.e., when the object residing at |from| is moved to |to| by the compaction
@@ skipping 84 matching lines @@
 
   enum ThreadHeapMode {
     MainThreadHeapMode,
     PerThreadHeapMode,
   };
 };
 
 }  // namespace blink
 
 #endif