Mojo: Move waiting APIs to public library

mojo/public/c/system/tests/core_perftest.cc

Index: mojo/public/c/system/tests/core_perftest.cc
diff --git a/mojo/public/c/system/tests/core_perftest.cc b/mojo/public/c/system/tests/core_perftest.cc
index 5d4e56b49814361ae04c76aa53cbf18330477869..cab465b43d75dfe9c4e16b3d483178ac3d74d4b0 100644
--- a/mojo/public/c/system/tests/core_perftest.cc
+++ b/mojo/public/c/system/tests/core_perftest.cc
@@ -12,6 +12,7 @@
 
 #include "base/macros.h"
 #include "base/threading/simple_thread.h"
+#include "mojo/public/cpp/system/wait.h"
 #include "mojo/public/cpp/test_support/test_support.h"
 #include "mojo/public/cpp/test_support/test_utils.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -85,8 +86,7 @@ class MessagePipeReaderThread : public base::SimpleThread {
       }
 
       if (result == MOJO_RESULT_SHOULD_WAIT) {
-        result = MojoWait(handle_, MOJO_HANDLE_SIGNAL_READABLE,
-                          MOJO_DEADLINE_INDEFINITE, nullptr);
+        result = mojo::Wait(mojo::Handle(handle_), MOJO_HANDLE_SIGNAL_READABLE);
         if (result == MOJO_RESULT_OK) {
           // Go to the top of the loop to read again.
           continue;