base: Add AsList() function to Value API.

chrome/browser/extensions/extension_webrequest_api_unittest.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 <queue>
 
 #include "base/file_util.h"
 #include "base/path_service.h"
 
 #include "chrome/browser/extensions/extension_event_router_forwarder.h"
@@ skipping 459 matching lines @@
     if (!args.GetString(0, &event_name) ||
         event_name !=  std::string(keys::kOnSendHeaders) + "/3") {
       continue;
     }
 
     std::string event_arg_string;
     ASSERT_TRUE(args.GetString(1, &event_arg_string));
 
     scoped_ptr<Value> event_arg_value(
         JSONStringValueSerializer(event_arg_string).Deserialize(NULL, NULL));
-    ASSERT_TRUE(event_arg_value.get() &&
-                event_arg_value->IsType(Value::TYPE_LIST));
+    ASSERT_TRUE(event_arg_value.get());
+    ListValue* list = event_arg_value->AsList();
+    ASSERT_TRUE(list);
 
     DictionaryValue* event_arg_dict = NULL;
-    ASSERT_TRUE(
-        static_cast<ListValue*>(event_arg_value.get())->GetDictionary(
-            0, &event_arg_dict));
+    ASSERT_TRUE(list->GetDictionary(0, &event_arg_dict));
 
     ListValue* request_headers = NULL;
     ASSERT_TRUE(event_arg_dict->GetList(keys::kRequestHeadersKey,
                                         &request_headers));
 
     net::HttpRequestHeaders observed_headers;
     for (size_t j = 0; j < request_headers->GetSize(); ++j) {
       DictionaryValue* header = NULL;
       ASSERT_TRUE(request_headers->GetDictionary(j, &header));
       std::string key;
@@ skipping 148 matching lines @@
          {"header2", "bar"} }
   },
 };
 
 INSTANTIATE_TEST_CASE_P(
     ExtensionWebRequest,
     ExtensionWebRequestHeaderModificationTest,
     ::testing::ValuesIn(kTests));
 
 } // namespace