Revert of Adds associated interface support to IPC::Channel

ipc/ipc_mojo_bootstrap.cc

Index: ipc/ipc_mojo_bootstrap.cc
diff --git a/ipc/ipc_mojo_bootstrap.cc b/ipc/ipc_mojo_bootstrap.cc
index 425f794858f02732f6ccf5736f51c0fcfadfb84f..dc8ffdc8134dce5d8b6b962f8cadfadcd4e3dd00 100644
--- a/ipc/ipc_mojo_bootstrap.cc
+++ b/ipc/ipc_mojo_bootstrap.cc
@@ -591,11 +591,6 @@
     endpoint_client_->set_connection_error_handler(handler);
   }
 
-  mojo::AssociatedGroup* associated_group() {
-    DCHECK(controller_);
-    return controller_->associated_group();
-  }
-
   void Bind(mojo::ScopedMessagePipeHandle handle) {
     DCHECK(!controller_);
     controller_ =
@@ -626,9 +621,6 @@
  private:
   // MojoBootstrap implementation.
   void Connect() override;
-  mojo::AssociatedGroup* GetAssociatedGroup() override {
-    return bootstrap_.associated_group();
-  }
 
   void OnInitDone(int32_t peer_pid);
 
@@ -688,9 +680,6 @@
  private:
   // MojoBootstrap implementation.
   void Connect() override;
-  mojo::AssociatedGroup* GetAssociatedGroup() override {
-    return binding_.associated_group();
-  }
 
   // mojom::Bootstrap implementation.
   void Init(mojom::ChannelAssociatedRequest receive_channel,