Make element removal methods in DictionaryValue and ListValue take scoped_ptr's as outparams.

chrome/common/extensions/api/extension_api.cc

 // Copyright (c) 2012 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/common/extensions/api/extension_api.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 186 matching lines @@
 }
 
 void ExtensionAPI::LoadSchema(const std::string& name,
                               const base::StringPiece& schema) {
   scoped_ptr<base::ListValue> schema_list(LoadSchemaList(name, schema));
   std::string schema_namespace;
 
   while (!schema_list->empty()) {
     base::DictionaryValue* schema = NULL;
     {
-      base::Value* value = NULL;
+      scoped_ptr<base::Value> value;
       schema_list->Remove(schema_list->GetSize() - 1, &value);
-      CHECK(value->IsType(base::Value::TYPE_DICTIONARY));
-      schema = static_cast<base::DictionaryValue*>(value);
+      CHECK(value.release()->GetAsDictionary(&schema));
     }
 
     CHECK(schema->GetString("namespace", &schema_namespace));
     PrefixWithNamespace(schema_namespace, schema);
     schemas_[schema_namespace] = make_linked_ptr(schema);
     if (!GeneratedSchemas::IsGenerated(schema_namespace))
       CHECK_EQ(1u, unloaded_schemas_.erase(schema_namespace));
   }
 }
 
@@ skipping 194 matching lines @@
       break;
 
     api_name_candidate = api_name_candidate.substr(0, last_dot_index);
   }
 
   *child_name = "";
   return std::string();
 }
 
 }  // namespace extensions