Use Mojo pipes to signal sync IPC events

mojo/public/cpp/bindings/sync_handle_registry.h

Index: mojo/public/cpp/bindings/sync_handle_registry.h
diff --git a/mojo/public/cpp/bindings/lib/sync_handle_registry.h b/mojo/public/cpp/bindings/sync_handle_registry.h
similarity index 88%
copy from mojo/public/cpp/bindings/lib/sync_handle_registry.h
copy to mojo/public/cpp/bindings/sync_handle_registry.h
index d6b8c38e0ce2843b3cb57561660273a11c8bc616..6c0701ef6f49cc5754089ba845cf9fd94c17f1fa 100644
--- a/mojo/public/cpp/bindings/lib/sync_handle_registry.h
+++ b/mojo/public/cpp/bindings/sync_handle_registry.h
@@ -2,8 +2,8 @@
 // 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>
 
@@ -14,7 +14,6 @@
 #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.
@@ -61,7 +60,6 @@ class SyncHandleRegistry : public base::RefCounted<SyncHandleRegistry> {
   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_