Mojo: Move waiting APIs to public library

mojo/public/cpp/bindings/sync_handle_registry.h

 // Copyright 2016 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.
 
 #ifndef MOJO_PUBLIC_CPP_BINDINGS_SYNC_HANDLE_REGISTRY_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_SYNC_HANDLE_REGISTRY_H_
 
 #include <unordered_map>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/threading/thread_checker.h"
 #include "mojo/public/cpp/bindings/bindings_export.h"
 #include "mojo/public/cpp/system/core.h"
+#include "mojo/public/cpp/system/wait_set.h"
 
 namespace mojo {
 
 // SyncHandleRegistry is a thread-local storage to register handles that want to
 // be watched together.
 //
 // This class is not thread safe.
 class MOJO_CPP_BINDINGS_EXPORT SyncHandleRegistry
     : public base::RefCounted<SyncHandleRegistry> {
  public:
@@ skipping 22 matching lines @@
       return std::hash<uint32_t>()(static_cast<uint32_t>(handle.value()));
     }
   };
   using HandleMap = std::unordered_map<Handle, HandleCallback, HandleHasher>;
 
   SyncHandleRegistry();
   ~SyncHandleRegistry();
 
   HandleMap handles_;
 
-  ScopedHandle wait_set_handle_;
+  WaitSet wait_set_;
 
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncHandleRegistry);
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_SYNC_HANDLE_REGISTRY_H_