Rewrite scoped_ptr<T>(NULL) to use the default ctor in chrome/.

chrome/renderer/extensions/user_script_slave.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/renderer/extensions/user_script_slave.h"
 
 #include <map>
 
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 108 matching lines @@
       }
     }
   }
 }
 
 void UserScriptSlave::RemoveIsolatedWorld(const std::string& extension_id) {
   isolated_world_ids_.erase(extension_id);
 }
 
 UserScriptSlave::UserScriptSlave(const ExtensionSet* extensions)
-    : shared_memory_(NULL),
-      script_deleter_(&scripts_),
-      extensions_(extensions) {
+    : script_deleter_(&scripts_), extensions_(extensions) {
   api_js_ = ResourceBundle::GetSharedInstance().GetRawDataResource(
       IDR_GREASEMONKEY_API_JS);
 }
 
 UserScriptSlave::~UserScriptSlave() {}
 
 void UserScriptSlave::GetActiveExtensions(
     std::set<std::string>* extension_ids) {
   for (size_t i = 0; i < scripts_.size(); ++i) {
     DCHECK(!scripts_[i]->extension_id().empty());
@@ skipping 237 matching lines @@
   } else if (location == UserScript::DOCUMENT_IDLE) {
     UMA_HISTOGRAM_COUNTS_100("Extensions.InjectIdle_ScriptCount", num_scripts);
     if (num_scripts)
       UMA_HISTOGRAM_TIMES("Extensions.InjectIdle_Time", timer.Elapsed());
   } else {
     NOTREACHED();
   }
 }
 
 }  // namespace extensions