Use std::unique_ptr for base::DictionaryValue and base::ListValue's internal store.

chrome/common/extensions/api/file_browser_handlers/file_browser_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/common/extensions/api/file_browser_handlers/file_browser_handler.h"
 
 #include <stddef.h>
 
 #include <memory>
 
@@ skipping 235 matching lines @@
 
   return result.release();
 }
 
 // Loads FileBrowserHandlers from |extension_actions| into a list in |result|.
 bool LoadFileBrowserHandlers(
     const std::string& extension_id,
     const base::ListValue* extension_actions,
     FileBrowserHandler::List* result,
     base::string16* error) {
-  for (base::ListValue::const_iterator iter = extension_actions->begin();
-       iter != extension_actions->end();
-       ++iter) {
-    if (!(*iter)->IsType(base::Value::TYPE_DICTIONARY)) {
+  for (const auto& entry : *extension_actions) {
+    base::DictionaryValue* dict;
+    if (!entry->GetAsDictionary(&dict)) {
       *error = base::ASCIIToUTF16(errors::kInvalidFileBrowserHandler);
       return false;
     }
-    std::unique_ptr<FileBrowserHandler> action(LoadFileBrowserHandler(
-        extension_id, reinterpret_cast<base::DictionaryValue*>(*iter), error));
+    std::unique_ptr<FileBrowserHandler> action(
+        LoadFileBrowserHandler(extension_id, dict, error));
     if (!action.get())
       return false;  // Failed to parse file browser action definition.
     result->push_back(linked_ptr<FileBrowserHandler>(action.release()));
   }
   return true;
 }
 
 }  // namespace
 
 bool FileBrowserHandlerParser::Parse(extensions::Extension* extension,
@@ skipping 25 matching lines @@
     return false;  // Failed to parse file browser actions definition.
   }
 
   extension->SetManifestData(keys::kFileBrowserHandlers, info.release());
   return true;
 }
 
 const std::vector<std::string> FileBrowserHandlerParser::Keys() const {
   return SingleKey(keys::kFileBrowserHandlers);
 }