Revert of ipc: Clean up interface of attachment broker.

ipc/ipc_channel.h

Index: ipc/ipc_channel.h
diff --git a/ipc/ipc_channel.h b/ipc/ipc_channel.h
index a9f70b24e34c9136401e755a973b26d236ab433f..c5c46a78048c1df8ce3d2e23bdf5a76a9ac83e24 100644
--- a/ipc/ipc_channel.h
+++ b/ipc/ipc_channel.h
@@ -165,7 +165,6 @@
       Listener* listener,
       AttachmentBroker* broker = nullptr);
 
-  Channel() : attachment_broker_endpoint_(false) {}
   ~Channel() override;
 
   // Connect the pipe.  On the server side, this will initiate
@@ -253,17 +252,6 @@
   static void NotifyProcessForkedForTesting();
 #endif
 
-  void set_attachment_broker_endpoint(bool is_endpoint) {
-    attachment_broker_endpoint_ = is_endpoint;
-  }
-
- protected:
-  bool is_attachment_broker_endpoint() { return attachment_broker_endpoint_; }
-
- private:
-  // Whether this channel is used as an endpoint for sending and receiving
-  // brokerable attachment messages to/from the broker process.
-  bool attachment_broker_endpoint_;
 };
 
 #if defined(OS_POSIX)