Use Mojo pipes to signal sync IPC events

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_LIB_SYNC_HANDLE_REGISTRY_H_
-#define MOJO_PUBLIC_CPP_BINDINGS_LIB_SYNC_HANDLE_REGISTRY_H_
+#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/system/core.h"
 
 namespace mojo {
-namespace internal {
 
 // SyncHandleRegistry is a thread-local storage to register handles that want to
 // be watched together.
 //
 // This class is not thread safe.
 class SyncHandleRegistry : public base::RefCounted<SyncHandleRegistry> {
  public:
   // Returns a thread-local object.
   static scoped_refptr<SyncHandleRegistry> current();
 
@@ skipping 26 matching lines @@
 
   HandleMap handles_;
 
   ScopedHandle wait_set_handle_;
 
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncHandleRegistry);
 };
 
-}  // namespace internal
 }  // namespace mojo
 
-#endif  // MOJO_PUBLIC_CPP_BINDINGS_LIB_SYNC_HANDLE_REGISTRY_H_
+#endif  // MOJO_PUBLIC_CPP_BINDINGS_SYNC_HANDLE_REGISTRY_H_