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

components/update_client/component_patcher.cc

 // Copyright 2014 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 "components/update_client/component_patcher.h"
 
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 60 matching lines @@
     next_command_ = commands_->begin();
     PatchNextFile();
   }
 }
 
 void ComponentPatcher::PatchNextFile() {
   if (next_command_ == commands_->end()) {
     DonePatching(ComponentUnpacker::kNone, 0);
     return;
   }
-  if (!(*next_command_)->IsType(base::Value::TYPE_DICTIONARY)) {
+  const base::DictionaryValue* command_args;
+  if (!(*next_command_)->GetAsDictionary(&command_args)) {
     DonePatching(ComponentUnpacker::kDeltaBadCommands, 0);
     return;
   }
-  const base::DictionaryValue* command_args =
-      static_cast<base::DictionaryValue*>(*next_command_);
 
   std::string operation;
   if (command_args->GetString(kOp, &operation)) {
     current_operation_ =
         CreateDeltaUpdateOp(operation, out_of_process_patcher_);
   }
 
   if (!current_operation_.get()) {
     DonePatching(ComponentUnpacker::kDeltaUnsupportedCommand, 0);
     return;
@@ skipping 16 matching lines @@
 
 void ComponentPatcher::DonePatching(ComponentUnpacker::Error error,
                                     int extended_error) {
   current_operation_ = NULL;
   task_runner_->PostTask(FROM_HERE,
                          base::Bind(callback_, error, extended_error));
   callback_.Reset();
 }
 
 }  // namespace update_client