Use ChannelMojo for plugin-renderer channels.

content/renderer/pepper/pepper_broker.cc

Index: content/renderer/pepper/pepper_broker.cc
diff --git a/content/renderer/pepper/pepper_broker.cc b/content/renderer/pepper/pepper_broker.cc
index 765e7b33e37745461bfc638af095d6e5ea6e4cb8..2651d0ed2d3a3d3363569d2c0dd9edfa4bb135f3 100644
--- a/content/renderer/pepper/pepper_broker.cc
+++ b/content/renderer/pepper/pepper_broker.cc
@@ -54,15 +54,9 @@ PepperBrokerDispatcherWrapper::~PepperBrokerDispatcherWrapper() {}
 bool PepperBrokerDispatcherWrapper::Init(
     base::ProcessId broker_pid,
     const IPC::ChannelHandle& channel_handle) {
-  if (channel_handle.name.empty())
+  if (!channel_handle.is_mojo_channel_handle())
     return false;
 
-#if defined(OS_POSIX)
-  DCHECK_NE(-1, channel_handle.socket.fd);
-  if (channel_handle.socket.fd == -1)
-    return false;
-#endif
-
   dispatcher_delegate_.reset(new PepperProxyChannelDelegateImpl);
   dispatcher_.reset(new ppapi::proxy::BrokerHostDispatcher());