IPC::Channel: Reduce POSIX specific API surface

ipc/ipc_channel_posix.cc

Index: ipc/ipc_channel_posix.cc
diff --git a/ipc/ipc_channel_posix.cc b/ipc/ipc_channel_posix.cc
index 3972788772eed771ecc1b3df6250492e4fece7dd..73c06454870eb5506528e8e24f94dc74a98e7ff3 100644
--- a/ipc/ipc_channel_posix.cc
+++ b/ipc/ipc_channel_posix.cc
@@ -177,6 +177,15 @@ void Channel::NotifyProcessForkedForTesting() {
 int ChannelPosix::global_pid_ = 0;
 #endif  // OS_LINUX
 
+// static
+scoped_ptr<ChannelPosix> ChannelPosix::Create(
+    const IPC::ChannelHandle& channel_handle, Mode mode,
+    Listener* listener) {
+  return make_scoped_ptr(new ChannelPosix(channel_handle,
+                                          mode,
+                                          listener));
+}
+
 ChannelPosix::ChannelPosix(const IPC::ChannelHandle& channel_handle,
                            Mode mode, Listener* listener)
     : ChannelReader(listener),
@@ -1056,8 +1065,7 @@ base::ProcessId ChannelPosix::GetPeerPID() const {
 // static
 scoped_ptr<Channel> Channel::Create(
     const IPC::ChannelHandle &channel_handle, Mode mode, Listener* listener) {
-  return scoped_ptr<Channel>(
-      new ChannelPosix(channel_handle, mode, listener));
+  return ChannelPosix::Create(channel_handle, mode, listener).PassAs<Channel>();
 }
 
 // static