Revert "Move mojo edk into mojo/edk"

mojo/system/data_pipe_unittest.cc

 // Copyright 2013 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/data_pipe.h"
+#include "mojo/system/data_pipe.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <limits>
 
-#include "mojo/edk/system/constants.h"
+#include "mojo/system/constants.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace mojo {
 namespace system {
 namespace {
 
 const uint32_t kSizeOfCreateOptions =
     static_cast<uint32_t>(sizeof(MojoCreateDataPipeOptions));
 
 // Does a cursory sanity check of |validated_options|. Calls
@@ skipping 345 matching lines @@
     MojoCreateDataPipeOptions unused;
     EXPECT_EQ(
         MOJO_RESULT_RESOURCE_EXHAUSTED,
         DataPipe::ValidateCreateOptions(MakeUserPointer(&options), &unused));
   }
 }
 
 }  // namespace
 }  // namespace system
 }  // namespace mojo