Revert of Mojo EDK: Introduce MojoQueryHandleSignalsState API

mojo/edk/system/core.cc

Index: mojo/edk/system/core.cc
diff --git a/mojo/edk/system/core.cc b/mojo/edk/system/core.cc
index 263f9cd6f859a4dacbabafd802dca0340bf7d35c..cfe01fabb156654f01d0bd5ee5b05be09f2e2db1 100644
--- a/mojo/edk/system/core.cc
+++ b/mojo/edk/system/core.cc
@@ -378,17 +378,6 @@
   return MOJO_RESULT_OK;
 }
 
-MojoResult Core::QueryHandleSignalsState(
-    MojoHandle handle,
-    MojoHandleSignalsState* signals_state) {
-  RequestContext request_context;
-  scoped_refptr<Dispatcher> dispatcher = GetDispatcher(handle);
-  if (!dispatcher || !signals_state)
-    return MOJO_RESULT_INVALID_ARGUMENT;
-  *signals_state = dispatcher->GetHandleSignalsState();
-  return MOJO_RESULT_OK;
-}
-
 MojoResult Core::Wait(MojoHandle handle,
                       MojoHandleSignals signals,
                       MojoDeadline deadline,