Use ChannelMojo between app shims and the browser process.

chrome/browser/apps/app_shim/app_shim_host_manager_mac.h

 // 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.
 
 #ifndef CHROME_BROWSER_APPS_APP_SHIM_APP_SHIM_HOST_MANAGER_MAC_H_
 #define CHROME_BROWSER_APPS_APP_SHIM_APP_SHIM_HOST_MANAGER_MAC_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/apps/app_shim/unix_domain_socket_acceptor.h"
 #include "content/public/browser/browser_thread.h"
+#include "mojo/edk/embedder/scoped_platform_handle.h"
 
 namespace apps {
 class ExtensionAppShimHandler;
 }
 
 namespace base {
 class FilePath;
 }
 
 namespace test {
@@ skipping 20 matching lines @@
 
  private:
   friend class base::RefCountedThreadSafe<AppShimHostManager>;
   friend struct content::BrowserThread::DeleteOnThread<
       content::BrowserThread::UI>;
   friend class base::DeleteHelper<AppShimHostManager>;
   friend class test::AppShimHostManagerTestApi;
   virtual ~AppShimHostManager();
 
   // UnixDomainSocketAcceptor::Delegate implementation.
-  void OnClientConnected(const IPC::ChannelHandle& handle) override;
+  void OnClientConnected(mojo::edk::ScopedPlatformHandle handle) override;
   void OnListenError() override;
 
   // The |acceptor_| must be created on a thread which allows blocking I/O, so
   // part of the initialization of this class must be carried out on the file
   // thread.
   void InitOnFileThread();
 
   // Called on the IO thread to begin listening for connections from app shims.
   void ListenOnIOThread();
 
   base::FilePath directory_in_tmp_;
 
   std::unique_ptr<apps::UnixDomainSocketAcceptor> acceptor_;
 
   std::unique_ptr<apps::ExtensionAppShimHandler> extension_app_shim_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(AppShimHostManager);
 };
 
 #endif  // CHROME_BROWSER_APPS_APP_SHIM_APP_SHIM_HOST_MANAGER_MAC_H_