Use ChannelMojo between app shims and the browser process.

chrome/browser/apps/app_shim/app_shim_host_manager_mac.mm

 // 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/browser/apps/app_shim/app_shim_host_manager_mac.h"
 
 #include <unistd.h>
 
 #include "base/base64.h"
 #include "base/bind.h"
@@ skipping 10 matching lines @@
 #include "chrome/browser/browser_process.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/mac/app_mode_common.h"
 #include "components/version_info/version_info.h"
 
 using content::BrowserThread;
 
 namespace {
 
-void CreateAppShimHost(const IPC::ChannelHandle& handle) {
+void CreateAppShimHost(mojo::edk::ScopedPlatformHandle handle) {
   // AppShimHost takes ownership of itself.
-  (new AppShimHost)->ServeChannel(handle);
+  (new AppShimHost)->ServeChannel(std::move(handle));
 }
 
 base::FilePath GetDirectoryInTmpTemplate(const base::FilePath& user_data_dir) {
   base::FilePath temp_dir;
   CHECK(PathService::Get(base::DIR_TEMP, &temp_dir));
   // Check that it's shorter than the IPC socket length (104) minus the
   // intermediate folder ("/chrome-XXXXXX/") and kAppShimSocketShortName.
   DCHECK_GT(83u, temp_dir.value().length());
   return temp_dir.Append("chrome-XXXXXX");
 }
@@ skipping 107 matching lines @@
 void AppShimHostManager::ListenOnIOThread() {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   if (!acceptor_->Listen()) {
     BrowserThread::PostTask(
         BrowserThread::UI, FROM_HERE,
         base::Bind(&AppShimHostManager::OnListenError, this));
   }
 }
 
 void AppShimHostManager::OnClientConnected(
-    const IPC::ChannelHandle& handle) {
+    mojo::edk::ScopedPlatformHandle handle) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
-      base::Bind(&CreateAppShimHost, handle));
+      base::Bind(&CreateAppShimHost, base::Passed(&handle)));
 }
 
 void AppShimHostManager::OnListenError() {
   // TODO(tapted): Set a timeout and attempt to reconstruct the channel. Until
   // cases where the error could occur are better known, just reset the acceptor
   // to allow failure to be communicated via the test API.
   acceptor_.reset();
 }