Revert recent changes to base::Value

chrome/test/automation/javascript_message_utils.h

 // 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.
 
 #ifndef CHROME_TEST_AUTOMATION_JAVASCRIPT_MESSAGE_UTILS_H_
 #define CHROME_TEST_AUTOMATION_JAVASCRIPT_MESSAGE_UTILS_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 33 matching lines @@
 
 template <typename T>
 struct ValueConversionTraits<std::vector<T> > {
   static Value* CreateValueFrom(const std::vector<T>& t) {
     ListValue* value = new ListValue();
     for (size_t i = 0; i < t.size(); i++) {
       value->Append(ValueConversionTraits<T>::CreateValueFrom(t[i]));
     }
     return value;
   }
-  static bool SetFromValue(Value* value, std::vector<T>* t) {
-    ListValue* list_value = value->AsList();
-    if (!list_value)
+  static bool SetFromValue(const Value* value, std::vector<T>* t) {
+    if (!value->IsType(Value::TYPE_LIST))
       return false;
 
+    const ListValue* list_value = static_cast<const ListValue*>(value);
     ListValue::const_iterator iter;
     for (iter = list_value->begin(); iter != list_value->end(); ++iter) {
       if (!ValueConversionTraits<T>::CanConvert(*iter))
         return false;
     }
     for (iter = list_value->begin(); iter != list_value->end(); ++iter) {
       T inner_value;
       ValueConversionTraits<T>::SetFromValue(*iter, &inner_value);
       t->push_back(inner_value);
     }
@@ skipping 34 matching lines @@
                              const T2& arg2, const T3& arg3) {
   return base::StringPrintf(format.c_str(),
                             JSONStringify(arg1).c_str(),
                             JSONStringify(arg2).c_str(),
                             JSONStringify(arg3).c_str());
 }
 
 }  // namespace javascript_utils
 
 #endif  // CHROME_TEST_AUTOMATION_JAVASCRIPT_MESSAGE_UTILS_H_