Mojo: Move public C system header files to mojo/public/c/system/.

mojo/public/c/system/core.h

Index: mojo/public/c/system/core.h
diff --git a/mojo/public/system/core.h b/mojo/public/c/system/core.h
similarity index 99%
rename from mojo/public/system/core.h
rename to mojo/public/c/system/core.h
index 6e155b132fafa9f1146623fd751e29e554a57374..968a5a7a3b6cbb1be3ad5eefdbaa93b194f183fe 100644
--- a/mojo/public/system/core.h
+++ b/mojo/public/c/system/core.h
@@ -2,15 +2,15 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef MOJO_PUBLIC_SYSTEM_CORE_H_
-#define MOJO_PUBLIC_SYSTEM_CORE_H_
+#ifndef MOJO_PUBLIC_C_SYSTEM_CORE_H_
+#define MOJO_PUBLIC_C_SYSTEM_CORE_H_
 
 // Note: This header should be compilable as C.
 
 #include <stdint.h>
 
-#include "mojo/public/system/macros.h"
-#include "mojo/public/system/system_export.h"
+#include "mojo/public/c/system/macros.h"
+#include "mojo/public/c/system/system_export.h"
 
 // Types/constants -------------------------------------------------------------
 
@@ -826,4 +826,4 @@ MOJO_SYSTEM_EXPORT MojoResult MojoUnmapBuffer(void* buffer);  // In.
 }  // extern "C"
 #endif
 
-#endif  // MOJO_PUBLIC_SYSTEM_CORE_H_
+#endif  // MOJO_PUBLIC_C_SYSTEM_CORE_H_