Revert "Let InputFlinger create the server InputChannel"

Revert submission 12594832-hide_server_input_channel

Reason for revert: <INSERT REASONING HERE>
Reverted Changes:
I7033caf10:Use new create/removeInputChannel().
I35f768c8a:Let InputFlinger create the server InputChannel

Bug: 169083114
Bug: 169088136
Change-Id: Ib6945129936006682cd03cea614fbdfd4f5fa008
diff --git a/services/inputflinger/host/InputFlinger.h b/services/inputflinger/host/InputFlinger.h
index 47773d9..577309a 100644
--- a/services/inputflinger/host/InputFlinger.h
+++ b/services/inputflinger/host/InputFlinger.h
@@ -48,10 +48,8 @@
                                    const sp<ISetInputWindowsListener>&) {
         return binder::Status::ok();
     }
-    binder::Status createInputChannel(const std::string&, InputChannel*) {
-        return binder::Status::ok();
-    }
-    binder::Status removeInputChannel(const sp<IBinder>&) { return binder::Status::ok(); }
+    binder::Status registerInputChannel(const InputChannel&) { return binder::Status::ok(); }
+    binder::Status unregisterInputChannel(const sp<IBinder>&) { return binder::Status::ok(); }
     binder::Status setFocusedWindow(const FocusRequest&) { return binder::Status::ok(); }
 
 private: