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

chrome/browser/policy/url_blacklist_policy_handler.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/policy/url_blacklist_policy_handler.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/prefs/pref_value_map.h"
 #include "base/values.h"
 #include "components/policy/core/browser/policy_error_map.h"
@@ skipping 53 matching lines @@
       if ((*entry)->GetAsString(&entry_value)) {
         entry_value.append("://*");
         merged_url_blacklist->AppendString(entry_value);
       }
     }
   }
 
   if (url_blacklist) {
     for (base::ListValue::const_iterator entry(url_blacklist->begin());
          entry != url_blacklist->end(); ++entry) {
-      if ((*entry)->IsType(Value::TYPE_STRING))
+      if ((*entry)->IsType(base::Value::TYPE_STRING))
         merged_url_blacklist->Append((*entry)->DeepCopy());
     }
   }
 
   if (disabled_schemes || url_blacklist) {
     prefs->SetValue(policy_prefs::kUrlBlacklist,
                     merged_url_blacklist.release());
   }
 }
 
 }  // namespace policy