Removed mutable from PassRefPtr's raw pointer member.

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

 /*
  *  Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 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 68 matching lines @@
 
   ALWAYS_INLINE ~PassRefPtr() { DerefIfNotNull(ptr_); }
 
   template <typename U>
   PassRefPtr(const RefPtr<U>&, EnsurePtrConvertibleArgDecl(U, T));
   template <typename U>
   PassRefPtr(RefPtr<U>&&, EnsurePtrConvertibleArgDecl(U, T));
 
   T* Get() const { return ptr_; }
 
-  WARN_UNUSED_RESULT T* LeakRef() const;
+  WARN_UNUSED_RESULT T* LeakRef();
 
   T& operator*() const { return *ptr_; }
   T* operator->() const { return ptr_; }
 
   bool operator!() const { return !ptr_; }
   explicit operator bool() const { return ptr_ != nullptr; }
 
   friend PassRefPtr AdoptRef<T>(T*);
 
  private:
   enum AdoptRefTag { kAdoptRef };
   PassRefPtr(T* ptr, AdoptRefTag) : ptr_(ptr) {}
 
   PassRefPtr& operator=(const PassRefPtr&) {
     static_assert(!sizeof(T*), "PassRefPtr should never be assigned to");
     return *this;
   }
 
-  mutable T* ptr_;
+  T* ptr_;
 };
 
 template <typename T>
 PassRefPtr<T> WrapPassRefPtr(T* ptr) {
   return PassRefPtr<T>(ptr);
 }
 
 template <typename T>
 template <typename U>
 inline PassRefPtr<T>::PassRefPtr(const RefPtr<U>& o,
                                  EnsurePtrConvertibleArgDefn(U, T))
     : ptr_(o.Get()) {
   T* ptr = ptr_;
   RefIfNotNull(ptr);
 }
 
 template <typename T>
 template <typename U>
 inline PassRefPtr<T>::PassRefPtr(RefPtr<U>&& o,
                                  EnsurePtrConvertibleArgDefn(U, T))
     : ptr_(o.LeakRef()) {}
 
 template <typename T>
-inline T* PassRefPtr<T>::LeakRef() const {
+inline T* PassRefPtr<T>::LeakRef() {
   T* ptr = ptr_;
   ptr_ = nullptr;
   return ptr;
 }
 
 template <typename T, typename U>
 inline bool operator==(const PassRefPtr<T>& a, const PassRefPtr<U>& b) {
   return a.Get() == b.Get();
 }
 
@@ skipping 72 matching lines @@
 inline T* GetPtr(const PassRefPtr<T>& p) {
   return p.Get();
 }
 
 }  // namespace WTF
 
 using WTF::PassRefPtr;
 using WTF::AdoptRef;
 
 #endif  // WTF_PassRefPtr_h