WTF::HashTraits: Remove unnecessary Peek() functions.

third_party/WebKit/Source/platform/wtf/HashTraits.h

 /*
  * Copyright (C) 2005, 2006, 2007, 2008, 2011, 2012 Apple Inc. All rights
  * reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 205 matching lines @@
       IteratorConstGetType x) {
     return *x;
   }
 
   static void Store(PassRefPtr<P> value, RefPtr<P>& storage) {
     storage = std::move(value);
   }
 
   typedef P* PeekOutType;
   static PeekOutType Peek(const RefPtr<P>& value) { return value.Get(); }
-  static PeekOutType Peek(std::nullptr_t) { return 0; }
 };
 
 template <typename T>
 struct HashTraits<std::unique_ptr<T>>
     : SimpleClassHashTraits<std::unique_ptr<T>> {
   using EmptyValueType = std::nullptr_t;
   static EmptyValueType EmptyValue() { return nullptr; }
 
   static const bool kHasIsEmptyValueFunction = true;
   static bool IsEmptyValue(const std::unique_ptr<T>& value) { return !value; }
 
   using PeekInType = T*;
 
   static void Store(std::unique_ptr<T>&& value, std::unique_ptr<T>& storage) {
     storage = std::move(value);
   }
 
   using PeekOutType = T*;
   static PeekOutType Peek(const std::unique_ptr<T>& value) {
     return value.get();
   }
-  static PeekOutType Peek(std::nullptr_t) { return nullptr; }
 
   static void ConstructDeletedValue(std::unique_ptr<T>& slot, bool) {
     // Dirty trick: implant an invalid pointer to unique_ptr. Destructor isn't
     // called for deleted buckets, so this is okay.
     new (NotNull, &slot) std::unique_ptr<T>(reinterpret_cast<T*>(1u));
   }
   static bool IsDeletedValue(const std::unique_ptr<T>& value) {
     return value.get() == reinterpret_cast<T*>(1u);
   }
 };
@@ skipping 161 matching lines @@
 };
 
 }  // namespace WTF
 
 using WTF::HashTraits;
 using WTF::PairHashTraits;
 using WTF::NullableHashTraits;
 using WTF::SimpleClassHashTraits;
 
 #endif  // WTF_HashTraits_h