Revert "Move mojo edk into mojo/edk"

mojo/system/platform_handle_dispatcher.cc

 // Copyright 2014 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.
 
-#include "mojo/edk/system/platform_handle_dispatcher.h"
+#include "mojo/system/platform_handle_dispatcher.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 
 namespace mojo {
 namespace system {
 
 namespace {
 
@@ skipping 93 matching lines @@
   } else {
     serialization->platform_handle_index = kInvalidPlatformHandleIndex;
   }
 
   *actual_size = sizeof(SerializedPlatformHandleDispatcher);
   return true;
 }
 
 }  // namespace system
 }  // namespace mojo