Use ChannelMojo between app shims and the browser process.

chrome/browser/apps/app_shim/app_shim_host_mac.cc

Index: chrome/browser/apps/app_shim/app_shim_host_mac.cc
diff --git a/chrome/browser/apps/app_shim/app_shim_host_mac.cc b/chrome/browser/apps/app_shim/app_shim_host_mac.cc
index edcce64de6ef6073d4e4529fa3429dba6e4453bf..59ba26db16155660097f98ad60cf72ebc34c7ff6 100644
--- a/chrome/browser/apps/app_shim/app_shim_host_mac.cc
+++ b/chrome/browser/apps/app_shim/app_shim_host_mac.cc
@@ -4,13 +4,17 @@
 
 #include "chrome/browser/apps/app_shim/app_shim_host_mac.h"
 
+#include <utility>
+
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "chrome/browser/apps/app_shim/app_shim_handler_mac.h"
 #include "chrome/common/mac/app_shim_messages.h"
 #include "content/public/browser/browser_thread.h"
+#include "ipc/ipc_channel_mojo.h"
 #include "ipc/ipc_channel_proxy.h"
+#include "mojo/edk/embedder/embedder.h"
 
 AppShimHost::AppShimHost() : initial_launch_finished_(false) {}
 
@@ -21,11 +25,17 @@ AppShimHost::~AppShimHost() {
     handler->OnShimClose(this);
 }
 
-void AppShimHost::ServeChannel(const IPC::ChannelHandle& handle) {
+void AppShimHost::ServeChannel(mojo::edk::ScopedPlatformHandle handle) {
   DCHECK(CalledOnValidThread());
   DCHECK(!channel_.get());
+
   channel_ = IPC::ChannelProxy::Create(
-      handle, IPC::Channel::MODE_SERVER, this,
+      IPC::ChannelMojo::CreateServerFactory(
+          mojo::edk::ConnectToPeerProcess(std::move(handle)),
+          content::BrowserThread::GetTaskRunnerForThread(
+              content::BrowserThread::IO)
+              .get()),
+      this,
       content::BrowserThread::GetTaskRunnerForThread(content::BrowserThread::IO)
           .get());
 }