Use ChannelMojo for plugin-renderer channels.

content/renderer/pepper/host_dispatcher_wrapper.cc

Index: content/renderer/pepper/host_dispatcher_wrapper.cc
diff --git a/content/renderer/pepper/host_dispatcher_wrapper.cc b/content/renderer/pepper/host_dispatcher_wrapper.cc
index 88d567a5cdb77d89db20998549ce965ca0e6c96b..370e755eb2892a9d37913b4b1359b291f18ee5db 100644
--- a/content/renderer/pepper/host_dispatcher_wrapper.cc
+++ b/content/renderer/pepper/host_dispatcher_wrapper.cc
@@ -40,12 +40,6 @@ bool HostDispatcherWrapper::Init(const IPC::ChannelHandle& channel_handle,
   if (channel_handle.name.empty())
     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::HostDispatcher(
       module_->pp_module(), local_get_interface, permissions_));