Mojo: Move mojo/public/utility to mojo/public/cpp/utility.

mojo/public/cpp/utility/mutex.h

Index: mojo/public/cpp/utility/mutex.h
diff --git a/mojo/public/utility/mutex.h b/mojo/public/cpp/utility/mutex.h
similarity index 92%
rename from mojo/public/utility/mutex.h
rename to mojo/public/cpp/utility/mutex.h
index 7928694e20285f1a2956710182ea402e542a249e..35611c2ba9a17e8bcb3d6f36ccc4b63af6a4dfed 100644
--- a/mojo/public/utility/mutex.h
+++ b/mojo/public/cpp/utility/mutex.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_UTILITY_MUTEX_H_
-#define MOJO_PUBLIC_UTILITY_MUTEX_H_
+#ifndef MOJO_PUBLIC_CPP_UTILITY_MUTEX_H_
+#define MOJO_PUBLIC_CPP_UTILITY_MUTEX_H_
 
 #ifdef _WIN32
 #error "Not implemented: See crbug.com/342893."
@@ -67,4 +67,4 @@ class MutexLock {
 
 }  // namespace mojo
 
-#endif  // MOJO_PUBLIC_UTILITY_MUTEX_H_
+#endif  // MOJO_PUBLIC_CPP_UTILITY_MUTEX_H_