Move mojo::{Wait,WaitMany}() to (the newly-added) mojo/public/cpp/system/wait.h.

services/tracing/tracing_app.cc

 // Copyright 2015 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 "services/tracing/tracing_app.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
+#include "mojo/public/cpp/system/wait.h"
 
 namespace tracing {
 
 TracingApp::TracingApp() : collector_binding_(this), tracing_active_(false) {}
 
 TracingApp::~TracingApp() {}
 
 bool TracingApp::ConfigureIncomingConnection(
     mojo::ApplicationConnection* connection) {
   connection->AddService<TraceCollector>(this);
@@ skipping 104 matching lines @@
   }
   AllDataCollected();
 }
 
 void TracingApp::AllDataCollected() {
   recorder_impls_.clear();
   sink_.reset();
 }
 
 }  // namespace tracing