Remove the default argument from RegKey::ReadValue.

base/registry.h

 // Copyright (c) 2010 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 BASE_REGISTRY_H_
 #define BASE_REGISTRY_H_
 #pragma once
 
 #include <windows.h>
-
 #include <string>
 
 #include "base/basictypes.h"
 
-// TODO(tfarina): Get rid of all the default arguments used in this file.
-// They are not allowed by our style guide.
-
 // Utility class to read, write and manipulate the Windows Registry.
 // Registry vocabulary primer: a "key" is like a folder, in which there
 // are "values", which are <name, data> pairs, with an associated data type.
 class RegKey {
  public:
   RegKey();
   RegKey(HKEY rootkey, const wchar_t* subkey, REGSAM access);
   ~RegKey();
 
   bool Create(HKEY rootkey, const wchar_t* subkey, REGSAM access);
@@ skipping 21 matching lines @@
 
   // Kill a key and everything that live below it; please be careful when using
   // it.
   bool DeleteKey(const wchar_t* name);
 
   // Deletes a single value within the key.
   bool DeleteValue(const wchar_t* name);
 
   bool ValueExists(const wchar_t* name);
 
-  bool ReadValue(const wchar_t* name, void* data, DWORD* dsize,
-                 DWORD* dtype = NULL);
+  bool ReadValue(const wchar_t* name, void* data, DWORD* dsize, DWORD* dtype);
   bool ReadValue(const wchar_t* name, std::wstring* value);
   bool ReadValueDW(const wchar_t* name, DWORD* value);
 
   bool WriteValue(const wchar_t* name, const void* data, DWORD dsize,
                   DWORD dtype);
   bool WriteValue(const wchar_t* name, const wchar_t* value);
   bool WriteValue(const wchar_t* name, DWORD value);
 
   // Starts watching the key to see if any of its values have changed.
   // The key must have been opened with the KEY_NOTIFY access privelege.
@@ skipping 90 matching lines @@
 
   // Current index of the iteration.
   int index_;
 
   wchar_t name_[MAX_PATH];
 
   DISALLOW_COPY_AND_ASSIGN(RegistryKeyIterator);
 };
 
 #endif  // BASE_REGISTRY_H_