Revert of Mojo EDK: Introduce MojoQueryHandleSignalsState API

mojo/edk/system/message_pipe_perftest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 #include <utility>
 
@@ skipping 29 matching lines @@
     read_buffer_.resize(message_size * 2);
   }
 
  protected:
   void WriteWaitThenRead(MojoHandle mp) {
     CHECK_EQ(MojoWriteMessage(mp, payload_.data(),
                               static_cast<uint32_t>(payload_.size()), nullptr,
                               0, MOJO_WRITE_MESSAGE_FLAG_NONE),
              MOJO_RESULT_OK);
     HandleSignalsState hss;
-    CHECK_EQ(WaitForSignals(mp, MOJO_HANDLE_SIGNAL_READABLE, &hss),
+    CHECK_EQ(MojoWait(mp, MOJO_HANDLE_SIGNAL_READABLE, MOJO_DEADLINE_INDEFINITE,
+                      &hss),
              MOJO_RESULT_OK);
     uint32_t read_buffer_size = static_cast<uint32_t>(read_buffer_.size());
     CHECK_EQ(MojoReadMessage(mp, &read_buffer_[0], &read_buffer_size, nullptr,
                              nullptr, MOJO_READ_MESSAGE_FLAG_NONE),
              MOJO_RESULT_OK);
     CHECK_EQ(read_buffer_size, static_cast<uint32_t>(payload_.size()));
   }
 
   void SendQuitMessage(MojoHandle mp) {
     CHECK_EQ(MojoWriteMessage(mp, "", 0, nullptr, 0,
@@ skipping 29 matching lines @@
 
     SendQuitMessage(mp);
   }
 
   static int RunPingPongClient(MojoHandle mp) {
     std::string buffer(1000000, '\0');
     int rv = 0;
     while (true) {
       // Wait for our end of the message pipe to be readable.
       HandleSignalsState hss;
-      MojoResult result = WaitForSignals(mp, MOJO_HANDLE_SIGNAL_READABLE, &hss);
+      MojoResult result =
+          MojoWait(mp, MOJO_HANDLE_SIGNAL_READABLE,
+                   MOJO_DEADLINE_INDEFINITE, &hss);
       if (result != MOJO_RESULT_OK) {
         rv = result;
         break;
       }
 
       uint32_t read_size = static_cast<uint32_t>(buffer.size());
       CHECK_EQ(MojoReadMessage(mp, &buffer[0],
                                &read_size, nullptr,
                                0, MOJO_READ_MESSAGE_FLAG_NONE),
                MOJO_RESULT_OK);
@@ skipping 47 matching lines @@
 // number of messages has been sent.
 TEST_F(MessagePipePerfTest, MultiprocessPingPong) {
   RUN_CHILD_ON_PIPE(PingPongClient, h)
     RunPingPongServer(h);
   END_CHILD()
 }
 
 }  // namespace
 }  // namespace edk
 }  // namespace mojo