ChannelMojo: Handle when ChannelMojo outlives ChannelMojoHost

ipc/mojo/ipc_channel_mojo.cc

Index: ipc/mojo/ipc_channel_mojo.cc
diff --git a/ipc/mojo/ipc_channel_mojo.cc b/ipc/mojo/ipc_channel_mojo.cc
index e61a90e6851bab3f2e983df7d17c37a6dada544f..b5c452990e7b559af5ed9f28f7af9331e9582ab6 100644
--- a/ipc/mojo/ipc_channel_mojo.cc
+++ b/ipc/mojo/ipc_channel_mojo.cc
@@ -83,7 +83,7 @@ ChannelMojo::ChannelMojo(ChannelMojoHost* host,
                          const ChannelHandle& handle,
                          Mode mode,
                          Listener* listener)
-    : host_(host),
+    : host_(host ? host->ToWeakPtr() : base::WeakPtr<ChannelMojoHost>()),

[viettrungluu, 2014/09/25 19:38:34]

Maybe it's better to just do in the body:

if (host) {
  host_ = host->ToWeakPtr();
  host_->OnChannelCreated(...);
}

[Hajime Morrita, 2014/09/25 22:00:03]

Done.

       mode_(mode),
       listener_(listener),
       peer_pid_(base::kNullProcessId),
@@ -92,14 +92,11 @@ ChannelMojo::ChannelMojo(ChannelMojoHost* host,
   // ChannelMojo from a different thread.
   bootstrap_ = MojoBootstrap::Create(handle, mode, this);
   if (host_)
-    host_->OnChannelCreated(this);
+    host_->OnChannelCreated(weak_factory_.GetWeakPtr());
 }
 
 ChannelMojo::~ChannelMojo() {
   Close();
-
-  if (host_)
-    host_->OnChannelDestroyed();
 }
 
 void ChannelMojo::InitControlReader(