Update some uses of Value in chrome/browser to use the base:: namespace.

chrome/browser/extensions/policy_handlers.cc

 // Copyright 2013 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 "chrome/browser/extensions/policy_handlers.h"
 
 #include "base/logging.h"
 #include "base/prefs/pref_value_map.h"
 #include "chrome/browser/extensions/external_policy_loader.h"
 #include "chrome/common/pref_names.h"
@@ skipping 221 matching lines @@
   }
 
   return true;
 }
 
 void ExtensionURLPatternListPolicyHandler::ApplyPolicySettings(
     const policy::PolicyMap& policies,
     PrefValueMap* prefs) {
   if (!pref_path_)
     return;
-  const Value* value = policies.GetValue(policy_name());
+  const base::Value* value = policies.GetValue(policy_name());
   if (value)
     prefs->SetValue(pref_path_, value->DeepCopy());
 }
 
 }  // namespace extensions