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

apps/app_shim/app_shim_host_mac.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 "apps/app_shim/app_shim_host_mac.h"
 
 #include "apps/app_shim/app_shim_handler_mac.h"
 #include "apps/app_shim/app_shim_messages.h"
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "content/public/browser/browser_thread.h"
 #include "ipc/ipc_channel_proxy.h"
 
-AppShimHost::AppShimHost()
-    : channel_(NULL), profile_(NULL) {
-}
+AppShimHost::AppShimHost() : profile_(NULL) {}
 
 AppShimHost::~AppShimHost() {
   DCHECK(CalledOnValidThread());
   apps::AppShimHandler* handler = apps::AppShimHandler::GetForAppMode(app_id_);
   if (handler)
     handler->OnShimClose(this);
 }
 
 void AppShimHost::ServeChannel(const IPC::ChannelHandle& handle) {
   DCHECK(CalledOnValidThread());
@@ skipping 95 matching lines @@
 }
 
 void AppShimHost::OnAppClosed() {
   Close();
 }
 
 void AppShimHost::Close() {
   DCHECK(CalledOnValidThread());
   delete this;
 }