base: Put DISALLOW_COPY_AND_ASSIGN inside private section of classes.

base/prefs/pref_member.h

 // Copyright (c) 2012 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.
 //
 // A helper class that stays in sync with a preference (bool, int, real,
 // string or filepath).  For example:
 //
 // class MyClass {
 //  public:
 //   MyClass(PrefService* prefs) {
@@ skipping 255 matching lines @@
    protected:
     virtual ~Internal() {}
 
     virtual BASE_PREFS_EXPORT bool UpdateValueInternal(
         const base::Value& value) const override;
 
     // We cache the value of the pref so we don't have to keep walking the pref
     // tree.
     mutable ValueType value_;
 
+   private:
     DISALLOW_COPY_AND_ASSIGN(Internal);
   };
 
   virtual Internal* internal() const override { return internal_.get(); }
   virtual void CreateInternal() const override { internal_ = new Internal(); }
 
   // This method is used to do the actual sync with pref of the specified type.
   void BASE_PREFS_EXPORT UpdatePref(const ValueType& value);
 
   mutable scoped_refptr<Internal> internal_;
@@ skipping 62 matching lines @@
 
 typedef PrefMember<bool> BooleanPrefMember;
 typedef PrefMember<int> IntegerPrefMember;
 typedef PrefMember<double> DoublePrefMember;
 typedef PrefMember<std::string> StringPrefMember;
 typedef PrefMember<base::FilePath> FilePathPrefMember;
 // This preference member is expensive for large string arrays.
 typedef PrefMember<std::vector<std::string> > StringListPrefMember;
 
 #endif  // BASE_PREFS_PREF_MEMBER_H_