base: Remove unnecessary using declarations from values.h

base/values.cc

 // Copyright (c) 2011 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.
 
 #include "base/values.h"
 
 #include "base/logging.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 
@@ skipping 41 matching lines @@
     }
 
     default:
       // For everything else, just make a copy.
       return node->DeepCopy();
   }
 }
 
 }  // namespace
 
+namespace base {
+
 ///////////////////// Value ////////////////////
 
 Value::~Value() {
 }
 
 // static
 Value* Value::CreateNullValue() {
   return new Value(TYPE_NULL);
 }
 
@@ skipping 827 matching lines @@
       return false;
   }
   if (lhs_it != end() || rhs_it != other_list->end())
     return false;
 
   return true;
 }
 
 ValueSerializer::~ValueSerializer() {
 }
+
+}  // namespace base