Revert "Move mojo edk into mojo/edk"

mojo/system/handle_signals_state.h

Index: mojo/system/handle_signals_state.h
diff --git a/mojo/edk/system/handle_signals_state.h b/mojo/system/handle_signals_state.h
similarity index 87%
rename from mojo/edk/system/handle_signals_state.h
rename to mojo/system/handle_signals_state.h
index 3391ea0fd3a7691252fb885c75da7d7cac302e67..f442cf51462b354e561baadf03ec0cecbc144a27 100644
--- a/mojo/edk/system/handle_signals_state.h
+++ b/mojo/system/handle_signals_state.h
@@ -2,12 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef MOJO_EDK_SYSTEM_HANDLE_SIGNALS_STATE_H_
-#define MOJO_EDK_SYSTEM_HANDLE_SIGNALS_STATE_H_
+#ifndef MOJO_SYSTEM_HANDLE_SIGNALS_STATE_H_
+#define MOJO_SYSTEM_HANDLE_SIGNALS_STATE_H_
 
 #include "base/macros.h"
-#include "mojo/edk/system/system_impl_export.h"
 #include "mojo/public/c/system/types.h"
+#include "mojo/system/system_impl_export.h"
 
 namespace mojo {
 namespace system {
@@ -47,4 +47,4 @@ static_assert(sizeof(HandleSignalsState) == sizeof(MojoHandleSignalsState),
 }  // namespace system
 }  // namespace mojo
 
-#endif  // MOJO_EDK_SYSTEM_HANDLE_SIGNALS_STATE_H_
+#endif  // MOJO_SYSTEM_HANDLE_SIGNALS_STATE_H_